Make PageScaleFactor work for oopif subframes.

content/browser/renderer_host/render_widget_host_view_base.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 124 matching lines @@
   // Tells if the display property (work area/scale factor) has
   // changed since the last time.
   bool HasDisplayPropertyChanged(gfx::NativeView view);
 
   // Called by the TextInputManager to notify the view about being removed from
   // the list of registered views, i.e., TextInputManager is no longer tracking
   // TextInputState from this view. The RWHV should reset |text_input_manager_|
   // to nullptr.
   void DidUnregisterFromTextInputManager(TextInputManager* text_input_manager);
 
+  void SetPageScaleFactorForSubframes(float page_scale);

[kenrb, 2017/01/24 17:13:27]

Is this called anywhere? I can't find a call site.

[wjmaclean, 2017/01/24 18:24:26]

Hmm, no ... I must have copied a stale piece of code during the gardening
process. I think I had originally planned on having RWHIER propagate via
WebContentsImpl, but then switched to sending via the GesturePinchEvents, except
for the part about reloading on restore.

Removed.

+
   base::WeakPtr<RenderWidgetHostViewBase> GetWeakPtr();
 
   //----------------------------------------------------------------------------
   // The following methods can be overridden by derived classes.
 
   // Notifies the View that the renderer text selection has changed.
   virtual void SelectionChanged(const base::string16& text,
                                 size_t offset,
                                 const gfx::Range& range);
 
@@ skipping 348 matching lines @@
   base::ObserverList<RenderWidgetHostViewBaseObserver> observers_;
 
   base::WeakPtrFactory<RenderWidgetHostViewBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_