Set projectLookup values in diff and change views

Moving this call from the router to the diff and change views helps
dedupe getChange calls when PolyGerrit is using a navigation component
other than gr-router, like in the embedded view scenario.

Change-Id: I41aff794af510d217792fc4d409d8d7d2dacab3d

polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html

diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html
index f377277..1639f73 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html
@@ -1729,5 +1729,18 @@
         });
       });
     });
+
+    test('_paramsChanged sets in projectLookup', () => {
+      sandbox.stub(element.$.relatedChanges, 'reload');
+      sandbox.stub(element, '_reload').returns(Promise.resolve());
+      const setStub = sandbox.stub(element.$.restAPI, 'setInProjectLookup');
+      element._paramsChanged({
+        view: Gerrit.Nav.View.CHANGE,
+        changeNum: 101,
+        project: 'test-project',
+      });
+      assert.isTrue(setStub.calledOnce);
+      assert.isTrue(setStub.calledWith(101, 'test-project'));
+    });
   });
 </script>