Make Page Visibility API work when the browser window is visible or not

content/public/browser/render_widget_host_view.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_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ skipping 128 matching lines @@
   // Begin subscribing for presentation events and captured frames.
   // |subscriber| is now owned by this object, it will be called only on the
   // UI thread.
   virtual void BeginFrameSubscription(
       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) = 0;
 
   // End subscribing for frame presentation events. FrameSubscriber will be
   // deleted after this call.
   virtual void EndFrameSubscription() = 0;
 
+  // Notifies the view that its enclosing window has changed visibility
+  // (minimized/unminimized, app hidden/unhidden, etc).
+  virtual void SetWindowVisibility(bool visible) = 0;
+
 #if defined(OS_MACOSX)
   // Set the view's active state (i.e., tint state of controls).
   virtual void SetActive(bool active) = 0;
 
-  // Notifies the view that its enclosing window has changed visibility
-  // (minimized/unminimized, app hidden/unhidden, etc).
-  // TODO(stuartmorgan): This is a temporary plugin-specific workaround for
-  // <http://crbug.com/34266>. Once that is fixed, this (and the corresponding
-  // message and renderer-side handling) can be removed in favor of using
-  // WasHidden/WasShown.
-  virtual void SetWindowVisibility(bool visible) = 0;
 
   // Informs the view that its containing window's frame changed.
   virtual void WindowFrameChanged() = 0;
 
   // Brings up the dictionary showing a definition for the selected text.
   virtual void ShowDefinitionForSelection() = 0;
 
   // Returns |true| if Mac OS X text to speech is supported.
   virtual bool SupportsSpeech() const = 0;
   // Tells the view to speak the currently selected text.
   virtual void SpeakSelection() = 0;
   // Returns |true| if text is currently being spoken by Mac OS X.
   virtual bool IsSpeaking() const = 0;
   // Stops speaking, if it is currently in progress.
   virtual void StopSpeaking() = 0;
 #endif  // defined(OS_MACOSX)
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_