Make PageScaleFactor work for oopif subframes.

content/renderer/render_view_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 390 matching lines @@
   blink::WebWidget* GetWebWidget() const override;
   void CloseForFrame() override;
   void Close() override;
   void OnResize(const ResizeParams& params) override;
   void OnSetFocus(bool enable) override;
   GURL GetURLForGraphicsContext3D() override;
   void OnOrientationChange() override;
   void DidCommitCompositorFrame() override;
   void DidCompletePageScaleAnimation() override;
   void OnDeviceScaleFactorChanged() override;
+  void OnSetPageScaleFactorForSubframes(double page_scale);
   void ResizeWebWidget() override;
 
   RenderViewImpl(CompositorDependencies* compositor_deps,
                  const mojom::CreateViewParams& params);
 
   void Initialize(const mojom::CreateViewParams& params,
                   const RenderWidget::ShowCallback& show_callback);
   void SetScreenMetricsEmulationParameters(
       bool enabled,
       const blink::WebDeviceEmulationParams& params) override;
@@ skipping 424 matching lines @@
   // ---------------------------------------------------------------------------
 
   base::WeakPtrFactory<RenderViewImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_