Expose the visibility state of a frame to the browser process.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 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_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <map>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/common/accessibility_mode_enums.h"
 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
 #include "content/common/frame_replication_state.h"
 #include "content/common/mojo/service_registry_impl.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/common/javascript_message_type.h"
 #include "net/http/http_response_headers.h"
+#include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
 #include "third_party/WebKit/public/web/WebTextDirection.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/base/page_transition_types.h"
 
 #if defined(OS_ANDROID)
 #include "content/browser/mojo/service_registry_android.h"
 #endif
 
 class GURL;
 struct AccessibilityHostMsg_EventParams;
@@ skipping 366 matching lines @@
 
   // Tears down the browser-side state relating to the Mojo connection between
   // this instance and its associated render frame.
   void InvalidateMojoConnection();
 
   // Returns whether the frame is focused. A frame is considered focused when it
   // is the parent chain of the focused frame within the frame tree. In
   // addition, its associated RenderWidgetHostView has to be focused.
   bool IsFocused();
 
+  // Returns the visibility state of the frame. The different visibility states
+  // of a frame are define in Blink.

[jochen (gone - plz use gerrit), 2015/01/26 16:18:51]

define*d*

[mlamouri (slow - plz ping), 2015/01/26 17:40:43]

Done.

+  blink::WebPageVisibilityState GetVisibilityState();
+
  protected:
   friend class RenderFrameHostFactory;
 
   // |flags| is a combination of CreateRenderFrameFlags.
   // TODO(nasko): Remove dependency on RenderViewHost here. RenderProcessHost
   // should be the abstraction needed here, but we need RenderViewHost to pass
   // into WebContentsObserver::FrameDetached for now.
   RenderFrameHostImpl(RenderViewHostImpl* render_view_host,
                       RenderFrameHostDelegate* delegate,
                       RenderWidgetHostDelegate* rwh_delegate,
@@ skipping 231 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_