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

chrome/browser/resources/pdf/browser_api.js

 // Copyright 2015 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';
 
 /**
  * Returns a promise that will resolve to the default zoom factor.
  * @param {!Object} streamInfo The stream object pointing to the data contained
  *     in the PDF.
@@ skipping 134 matching lines @@
 
 /**
  * Creates a BrowserApi for an extension running as a mime handler.
  * @return {Promise<BrowserApi>} A promise to a BrowserApi instance constructed
  *     using the mimeHandlerPrivate API.
  */
 function createBrowserApiForMimeHandlerView() {
   return new Promise(function(resolve, reject) {
     chrome.mimeHandlerPrivate.getStreamInfo(resolve);
   }).then(function(streamInfo) {
+    let promises = [];
     let manageZoom = !streamInfo.embedded && streamInfo.tabId != -1;
-    return new Promise(function(resolve, reject) {
-      if (!manageZoom) {
-        resolve();
-        return;
-      }
-      chrome.tabs.setZoomSettings(
-          streamInfo.tabId, {mode: 'manual', scope: 'per-tab'}, resolve);
-    }).then(function() { return BrowserApi.create(streamInfo, manageZoom); });
+    if (streamInfo.tabId != -1) {
+      promises.push(new Promise(function(resolve) {
+        chrome.tabs.get(streamInfo.tabId, resolve);
+      }).then(function(tab) {
+        if (tab)
+          streamInfo.tabUrl = tab.url;
+      }));
+    }
+    if (manageZoom) {
+      promises.push(new Promise(function(resolve) {
+        chrome.tabs.setZoomSettings(
+            streamInfo.tabId, {mode: 'manual', scope: 'per-tab'}, resolve);
+      }));
+    }
+    return Promise.all(promises).then(
+        function() { return BrowserApi.create(streamInfo, manageZoom); });
   });
 }
 
 /**
  * Creates a BrowserApi instance for an extension not running as a mime handler.
  * @return {Promise<BrowserApi>} A promise to a BrowserApi instance constructed
  *     from the URL.
  */
 function createBrowserApiForStandaloneExtension() {
   let url = window.location.search.substring(1);
   let streamInfo = {
     streamUrl: url,
     originalUrl: url,
     responseHeaders: {},
     embedded: window.parent != window,
     tabId: -1,
   };
   return new Promise(function(resolve, reject) {
     if (!chrome.tabs) {
       resolve();
       return;
     }
     chrome.tabs.getCurrent(function(tab) {
       streamInfo.tabId = tab.id;
+      streamInfo.tabUrl = tab.url;
       resolve();
     });
   }).then(function() { return BrowserApi.create(streamInfo, false); });
 }
 
 /**
  * Returns a promise that will resolve to a BrowserApi instance.
  * @return {Promise<BrowserApi>} A promise to a BrowserApi instance for the
  *     current environment.
  */
 function createBrowserApi() {
   if (window.location.search)
     return createBrowserApiForStandaloneExtension();
 
   return createBrowserApiForMimeHandlerView();
 }