Add zoom extension API

chrome/browser/renderer_host/render_message_filter.cc

Index: chrome/browser/renderer_host/render_message_filter.cc
diff --git a/chrome/browser/renderer_host/render_message_filter.cc b/chrome/browser/renderer_host/render_message_filter.cc
index b5ed28f19e0c50d6af079dd294e0524d1440281a..fdad432a8a2737ac0a726fa841c5918fbc0e24aa 100644
--- a/chrome/browser/renderer_host/render_message_filter.cc
+++ b/chrome/browser/renderer_host/render_message_filter.cc
@@ -974,12 +974,13 @@ void RenderMessageFilter::OnV8HeapStatsOnUIThread(
 }
 
 void RenderMessageFilter::OnDidZoomURL(const IPC::Message& message,
+                                       int request_id,
                                        double zoom_level,
                                        bool remember,
                                        const GURL& url) {
   Task* task = NewRunnableMethod(this,
-      &RenderMessageFilter::UpdateHostZoomLevelsOnUIThread, zoom_level,
-      remember, url, render_process_id_, message.routing_id());
+      &RenderMessageFilter::UpdateHostZoomLevelsOnUIThread, request_id,
+      zoom_level, remember, url, render_process_id_, message.routing_id());
 #if defined(OS_MACOSX)
   cocoa_utils::PostTaskInEventTrackingRunLoopMode(FROM_HERE, task);
 #else
@@ -988,6 +989,7 @@ void RenderMessageFilter::OnDidZoomURL(const IPC::Message& message,
 }
 
 void RenderMessageFilter::UpdateHostZoomLevelsOnUIThread(
+    int request_id,
     double zoom_level,
     bool remember,
     const GURL& url,
@@ -995,7 +997,7 @@ void RenderMessageFilter::UpdateHostZoomLevelsOnUIThread(
     int render_view_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (remember) {
-    host_zoom_map_->SetZoomLevel(url, zoom_level);
+    host_zoom_map_->SetZoomLevel(url, request_id, zoom_level);
     // Notify renderers from this profile.
     for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
          !i.IsAtEnd(); i.Advance()) {
@@ -1007,7 +1009,7 @@ void RenderMessageFilter::UpdateHostZoomLevelsOnUIThread(
     }
   } else {
     host_zoom_map_->SetTemporaryZoomLevel(
-        render_process_id, render_view_id, zoom_level);
+        render_process_id, render_view_id, request_id, zoom_level);
   }
 }