Make PageScaleFactor work for oopif subframes.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 7b5b70b4f2c14352e66aa7114a3fdb14be329f2f..35b06d56dc4c5a8beb783038a342c6d09304bab3 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4515,6 +4515,11 @@ void RenderFrameImpl::didChangeScrollOffset(blink::WebLocalFrame* frame) {
     observer.DidChangeScrollOffset();
 }
 
+void RenderFrameImpl::didRestorePageScaleFactorOnLoad(float page_scale) {
+  // Notify the web contents so it can update cross-process frames.
+  Send(new FrameHostMsg_RestorePageScaleFactorOnLoad(routing_id_, page_scale));
+}
+
 void RenderFrameImpl::willInsertBody(blink::WebLocalFrame* frame) {
   DCHECK(!frame_ || frame_ == frame);
   if (!frame->parent()) {