Ignore show messages from RemoteFrames when the WebContents is hidden.

content/browser/renderer_host/render_widget_host_delegate.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_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 176 matching lines @@
   virtual void SendScreenRects() {}
 
   // Notifies that the main frame in the renderer has performed the first paint
   // after a navigation.
   virtual void OnFirstPaintAfterLoad(RenderWidgetHostImpl* render_widget_host) {
   }
 
   // Returns the TextInputManager tracking text input state.
   virtual TextInputManager* GetTextInputManager();
 
+  // Returns true if this RenderWidgetHost should be hidden.

[kenrb, 2016/07/18 17:11:45]

I don't think this comment is very clear. My interpretation of this method would
be that it asks the delegate if the RenderWidgetHost can be shown, in the event
that something other than the WebContents is attempting to enable visibility.
It's a bit subtle and should be made more clear.

[lfg, 2016/07/18 17:44:00]

Yes, that interpretation is correct. I tried to clarify the comments based on
your suggestion, let me know what you think.

+  virtual bool IsHidden();
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_