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

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index c9193a3080131997b6b1f299a898d078efba9ae2..b7c357a39c3b68551b8ced4e50e1211041b61558 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -24,6 +24,7 @@
 #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"
@@ -410,6 +411,10 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // 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;