Record the PDF and top level URL when the PDF plugin crashes.

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 184 matching lines @@
   for (var header in this.browserApi_.getStreamInfo().responseHeaders) {
     headers += header + ': ' +
         this.browserApi_.getStreamInfo().responseHeaders[header] + '\n';
   }
   this.plugin_.setAttribute('headers', headers);
 
   var backgroundColor = PDFViewer.DARK_BACKGROUND_COLOR;
   this.plugin_.setAttribute('background-color', backgroundColor);
   this.plugin_.setAttribute('top-toolbar-height', topToolbarHeight);
 
-  if (!this.browserApi_.getStreamInfo().embedded)
+  if (this.browserApi_.getStreamInfo().embedded) {
+    this.plugin_.setAttribute('embedder-url',

[raymes, 2016/09/05 04:11:47]

I think top-level-url may be more accurate here (there may be several layers of
embedder, but we will only record the top level one.

[Lei Zhang, 2016/09/07 00:12:39]

Done in all the places.

+                              this.browserApi_.getStreamInfo().tabUrl);
+  } else {
     this.plugin_.setAttribute('full-frame', '');

[raymes, 2016/09/05 04:11:47]

optional: We could merge this with top-level-url and define empty as full-frame.
It would save parsing an additional param (though we would still probably want
to record a URL in the crash report). I'll leave that up to you.

[Lei Zhang, 2016/09/07 00:12:38]

Can we ever be embedded, but have an empty top-level URL somehow? I'm not 100%
sure, so I've left the two separate.

+  }
   document.body.appendChild(this.plugin_);
 
   // Setup the button event listeners.
   this.zoomToolbar_ = $('zoom-toolbar');
   this.zoomToolbar_.addEventListener('fit-to-width',
       this.viewport_.fitToWidth.bind(this.viewport_));
   this.zoomToolbar_.addEventListener('fit-to-page',
       this.fitToPage_.bind(this));
   this.zoomToolbar_.addEventListener('zoom-in',
       this.viewport_.zoomIn.bind(this.viewport_));
@@ skipping 663 matching lines @@
    * Each bookmark is an Object containing a:
    * - title
    * - page (optional)
    * - array of children (themselves bookmarks)
    * @type {Array} the top-level bookmarks of the PDF.
    */
   get bookmarks() {
     return this.bookmarks_;
   }
 };