Make PageScaleFactor work for oopif subframes.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 9bd4612991071af3e90a68a085ec69773a569828..0c4e13438241259c20d4e5fc87a306c6e9e3209e 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -617,6 +617,7 @@ class CONTENT_EXPORT RenderFrameImpl
                                 v8::Local<v8::Context> context,
                                 int world_id) override;
   void didChangeScrollOffset(blink::WebLocalFrame* frame) override;
+  void didRestorePageScaleFactorOnLoad(float page_scale) override;
   void willInsertBody(blink::WebLocalFrame* frame) override;
   void reportFindInPageMatchCount(int request_id,
                                   int count,
@@ -898,6 +899,8 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnFileChooserResponse(
       const std::vector<content::FileChooserFileInfo>& files);
   void OnClearFocusedElement();
+  void OnSetPageScaleFactorForSubframe(double page_scale_factor);
+
 #if defined(OS_ANDROID)
   void OnActivateNearestFindResult(int request_id, float x, float y);
   void OnGetNearestFindResult(int request_id, float x, float y);