blame: Add base url to _getBlameForBaseLine

Change-Id: I4f60801383ec07a1a0997da0226f685ad9faec16

polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element_test.js

@@ -21,6 +21,7 @@ import './gr-diff-builder.js';
 import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
 import {getMockDiffResponse} from '../../../test/mocks/diff-response.js';
 import './gr-diff-builder-element.js';
+import {stubBaseUrl} from '../../../test/test-utils.js';
 import {dom, flush} from '@polymer/polymer/lib/legacy/polymer.dom.js';
 import {GrAnnotation} from '../gr-diff-highlight/gr-annotation.js';
 import {GrDiffLine} from '../gr-diff/gr-diff-line.js';
@@ -62,6 +63,7 @@ suite('gr-diff-builder tests', () => {
       getLoggedIn() { return Promise.resolve(false); },
       getProjectConfig() { return Promise.resolve({}); },
     });
+    stubBaseUrl('/r');
     prefs = {
       line_length: 10,
       show_tabs: true,
@@ -1230,6 +1232,9 @@ suite('gr-diff-builder tests', () => {
           `Commit 1234567890<br>Author: Clark Kent<br>Date: ${date}`
         + '<br><br>Testing Commit'
       );
+
+      const url = blameNode.getElementsByClassName('blameDate');
+      assert.equal(url[0].getAttribute('href'), '/r/q/1234567890');
     });
   });
 });

polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.js

@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import {getBaseUrl} from '../../../utils/url-util.js';
 import {GrDiffLine} from '../gr-diff/gr-diff-line.js';
 import {GrDiffGroup} from '../gr-diff/gr-diff-group.js';
 import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
@@ -611,7 +612,7 @@ GrDiffBuilder.prototype._getBlameForBaseLine = function(lineNum, opt_commit) {
 
   const shaNode = this._createElement('a', 'blameDate');
   shaNode.innerText = `${date}`;
-  shaNode.setAttribute('href', `/q/${commit.id}`);
+  shaNode.setAttribute('href', `${getBaseUrl()}/q/${commit.id}`);
   blameNode.appendChild(shaNode);
 
   const shortName = commit.author.split(' ')[0];