Make PageScaleFactor work for oopif subframes.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index ef0e15cfe089cd45d0028deb540f829369f6a4d5..c5563bf6c193bee068b2ab22ea9fc838cc22e916 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -766,6 +766,8 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(FrameHostMsg_HidePopup, OnHidePopup)
 #endif
     IPC_MESSAGE_HANDLER(FrameHostMsg_ShowCreatedWindow, OnShowCreatedWindow)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_RestorePageScaleFactorOnLoad,
+                        OnSetPageScaleFactorForSubframes)
   IPC_END_MESSAGE_MAP()
 
   // No further actions here, since we may have been deleted.
@@ -2239,6 +2241,17 @@ void RenderFrameHostImpl::OnShowCreatedWindow(int pending_widget_routing_id,
                                disposition, initial_rect, user_gesture);
 }
 
+void RenderFrameHostImpl::OnSetPageScaleFactorForSubframes(
+    double page_scale_factor) {
+  // Only the main frame should be receiving this message.
+  if (!frame_tree_node_->IsMainFrame()) {
+    NOTREACHED();
+    return;
+  }
+
+  delegate_->SetPageScaleFactorForSubframes(page_scale_factor);
+}
+
 void RenderFrameHostImpl::RegisterMojoInterfaces() {
   device::GeolocationServiceContext* geolocation_service_context =
       delegate_ ? delegate_->GetGeolocationServiceContext() : NULL;