Add "Mark reviewed" shortcut for diff view

Bug: Issue 8393
Change-Id: Ie131f9a0a75fe2c0204cd36c0a03e9640fe1e915

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

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
index 9776d4a..6dff570 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
@@ -158,6 +158,15 @@
       MockInteractions.pressAndReleaseKeyOn(element, 27, null, 'esc');
       assert(computeContainerClassStub.lastCall.calledWithExactly(
           false, 'SIDE_BY_SIDE', false));
+
+      sandbox.stub(element, '_setReviewed');
+      element.$.reviewed.checked = false;
+      MockInteractions.pressAndReleaseKeyOn(element, 82, 'shift', 'r');
+      assert.isFalse(element._setReviewed.called);
+
+      MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+      assert.isTrue(element._setReviewed.called);
+      assert.equal(element._setReviewed.lastCall.args[0], true);
     });
 
     test('keyboard shortcuts with patch range', () => {