Add @license tags to PG HTML and JS assets

These tags are preserved by the Closure compiler and vulcanize in order
to serve the license notices embedded in the outputs. In a standalone
Gerrit server, these license are also covered in the LICENSES.txt served
with the documentation. When serving PG assets from a CDN, it's less
obvious what the corresponding LICENSES.txt file is, since the CDN is
not directly linked to a running Gerrit server. Safer to embed the
licenses in the assets themselves.

Change-Id: Id1add1451fad1baa7916882a6bda02c326ccc988
diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.html b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.html
index 5290bba..093e979 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.html
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -39,4 +40,4 @@
         on-input="_handleTextareaInput"></textarea>
   </template>
   <script src="gr-default-editor.js"></script>
-</dom-module>
\ No newline at end of file
+</dom-module>
diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
index f30f9fa..168ded8 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
@@ -1,16 +1,19 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 (function() {
   'use strict';
 
@@ -32,4 +35,4 @@
           {detail: {value: e.target.value}, bubbles: true}));
     },
   });
-})();
\ No newline at end of file
+})();
diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html
index 43ec9e5..b79cd9d 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -52,4 +53,4 @@
           {target: textarea, bubbles: true}));
     });
   });
-</script>
\ No newline at end of file
+</script>
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-constants.html b/polygerrit-ui/app/elements/edit/gr-edit-constants.html
index 4bae900..d526ccd 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-constants.html
+++ b/polygerrit-ui/app/elements/edit/gr-edit-constants.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -29,4 +30,4 @@
 
     window.GrEditConstants = GrEditConstants;
   })(window);
-</script>
\ No newline at end of file
+</script>
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.html b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.html
index 2acbab5..2226383 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.html
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -157,4 +158,4 @@
     <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
   </template>
   <script src="gr-edit-controls.js"></script>
-</dom-module>
\ No newline at end of file
+</dom-module>
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
index e3b3494..8740b0d 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
@@ -1,16 +1,19 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 (function() {
   'use strict';
 
@@ -221,4 +224,4 @@
       return hiddenActions.includes(id) ? 'invisible' : '';
     },
   });
-})();
\ No newline at end of file
+})();
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.html b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.html
index 6e6f7d9..c67a2af 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.html
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.html b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.html
index 9863466..fd6aeb0 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.html
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -58,4 +59,4 @@
         link>Actions</gr-dropdown>
   </template>
   <script src="gr-edit-file-controls.js"></script>
-</dom-module>
\ No newline at end of file
+</dom-module>
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
index 6a0ccf5..82010f5 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
@@ -1,16 +1,19 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 (function() {
   'use strict';
 
@@ -56,4 +59,4 @@
       });
     },
   });
-})();
\ No newline at end of file
+})();
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_test.html b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_test.html
index 27b28fa..12d9e0b 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_test.html
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls_test.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -99,4 +100,4 @@
     assert.equal(element._allFileActions.length, 4);
   });
 });
-</script>
\ No newline at end of file
+</script>
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.html b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.html
index 8f2f166..8939a4f 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.html
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -121,4 +122,4 @@
     <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
   </template>
   <script src="gr-editor-view.js"></script>
-</dom-module>
\ No newline at end of file
+</dom-module>
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
index bd07375..f2d1d76 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
@@ -1,16 +1,19 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 (function() {
   'use strict';
 
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_test.html b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_test.html
index ea87f56..193c2ed 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_test.html
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view_test.html
@@ -1,4 +1,5 @@
 <!--
+@license
 Copyright (C) 2017 The Android Open Source Project
 
 Licensed under the Apache License, Version 2.0 (the "License");