Make PageScaleFactor work for oopif subframes.

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 207 matching lines @@
   virtual void runScriptsAtDocumentReady(bool documentIsEmpty) = 0;
 
   virtual void didCreateScriptContext(v8::Local<v8::Context>,
                                       int worldId) = 0;
   virtual void willReleaseScriptContext(v8::Local<v8::Context>,
                                         int worldId) = 0;
   virtual bool allowScriptExtensions() = 0;
 
   virtual void didChangeScrollOffset() {}
   virtual void didUpdateCurrentHistoryItem() {}
+  virtual void didRestorePageScaleFactorOnLoad(float pageScale) {}
 
   virtual bool allowScript(bool enabledPerSettings) {
     return enabledPerSettings;
   }
   virtual bool allowScriptFromSource(bool enabledPerSettings, const KURL&) {
     return enabledPerSettings;
   }
   virtual bool allowPlugins(bool enabledPerSettings) {
     return enabledPerSettings;
   }
@@ skipping 100 matching lines @@
   virtual KURL overrideFlashEmbedWithHTML(const KURL&) { return KURL(); }
 
   virtual BlameContext* frameBlameContext() { return nullptr; }
 
   virtual void setHasReceivedUserGesture() {}
 };
 
 }  // namespace blink
 
 #endif  // FrameLoaderClient_h