Expand patchset if patchsetID provided in URL

appengine/chromium_rietveld/new_static/components/cr-issue-patchset.html

 <!-- Copyright (c) 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
 
 <link rel="import" href="../common/cr-action.html">
 <link rel="import" href="../common/cr-toolbar.html">
 <link rel="import" href="cr-issue-cq-dry-run-dialog.html">
 <link rel="import" href="cr-issue-patchfile.html">
 <link rel="import" href="cr-try-results.html">
 <link rel="import" href="../diff/cr-diff-controls.html">
@@ skipping 46 matching lines @@
                 </h2>
                 <template if="{{ tryJobResults.length }}">
                     <cr-try-results results="{{ tryJobResults }}"></cr-try-results>
                 </template>
                 <template if="{{ patchset.mostRecent && !patchset.issue.closed && !patchset.issue.commit }}">
                     <a class="choose-trybots" is="cr-action" on-tap="{{ handleAddMore }}">Choose try jobs</a> /
                     <a class="trigger-dry-run" is="cr-action" on-tap="{{ showDryRunDialog }}">CQ dry run</a>
                 </template>
             </div>
         </template>
+        <a class="patchset-id">(Patchset Id: {{ patchset.id }})</a>

[jrobbins, 2015/06/02 19:50:44]

I realize you tried to limit visual clutter by making this a smaller font. 
However, let's go further than that and have it not shown on the page at all. 
Instead, use a title="" attribute on the <div class="patchset-title"> element. 
You can delete the .patchset-id CSS.

[rmistry, 2015/06/02 20:35:54]

Done. We can revisit this if users complain about not knowing what the patchset
ID is easily.

Staged here: https://skia-codereview-staging.appspot.com/1891001/#ps1

         <div id="dialogs"></div>
     </template>
     <script>
         Polymer({
             created: function() {
                 this.patchset = null;
                 this.tryJobResults = null;
             },
             showDryRunDialog: function() {
               if (this.patchset.issue.closed)
@@ skipping 31 matching lines @@
                 return Promise.all(this.getFiles().map(function(file) {
                     return file.hideDiff();
                 }));
             },
             handleAddMore: function() {
                 this.fire("show-try-dialog");
             },
         });
     </script>
 </polymer-element>