Bug 1038245 - Add multiprocess field to about:support (r=felipe)

toolkit/content/aboutSupport.js

@@ -39,6 +39,7 @@ let snapshotFormatters = {
     if (data.vendor)
       version += " (" + data.vendor + ")";
     $("version-box").textContent = version;
+    $("multiprocess-box").textContent = data.numRemoteWindows + "/" + data.numTotalWindows;
   },
 
 #ifdef MOZ_CRASHREPORTER

toolkit/content/aboutSupport.xhtml

@@ -163,6 +163,15 @@
             </td>
           </tr>
 
+          <tr>
+            <th class="column">
+              &aboutSupport.appBasicsMultiProcessSupport;
+            </th>
+
+            <td id="multiprocess-box">
+            </td>
+          </tr>
+
         </tbody>
       </table>
 

toolkit/locales/en-US/chrome/global/aboutSupport.dtd

@@ -54,6 +54,8 @@ Windows/Mac use the term "Folder" instead of "Directory" -->
 <!ENTITY aboutSupport.appBasicsUserAgent "User Agent">
 <!ENTITY aboutSupport.appBasicsMemoryUse "Memory Use">
 
+<!ENTITY aboutSupport.appBasicsMultiProcessSupport "Multiprocess Windows">
+
 <!ENTITY aboutSupport.showDir.label "Open Directory">
 <!-- LOCALIZATION NOTE (aboutSupport.showMac.label): This is the Mac-specific
 variant of aboutSupport.showDir.label.  This allows us to use the preferred

toolkit/modules/Troubleshoot.jsm

@@ -145,6 +145,22 @@ let dataProviders = {
       data.supportURL = urlFormatter.formatURLPref("app.support.baseURL");
     }
     catch (e) {}
+
+    data.numTotalWindows = 0;
+    data.numRemoteWindows = 0;
+    let winEnumer = Services.ww.getWindowEnumerator("navigator:browser");
+    while (winEnumer.hasMoreElements()) {
+      data.numTotalWindows++;
+      let remote = winEnumer.getNext().
+                   QueryInterface(Ci.nsIInterfaceRequestor).
+                   getInterface(Ci.nsIWebNavigation).
+                   QueryInterface(Ci.nsILoadContext).
+                   useRemoteTabs;
+      if (remote) {
+        data.numRemoteWindows++;
+      }
+    }
+
     done(data);
   },
 

toolkit/modules/tests/browser/browser_Troubleshoot.js

@@ -98,6 +98,12 @@ const SNAPSHOT_SCHEMA = {
         supportURL: {
           type: "string",
         },
+        numTotalWindows: {
+          type: "number",
+        },
+        numRemoteWindows: {
+          type: "number",
+        },
       },
     },
     crashes: {