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

content/browser/frame_host/render_frame_host_impl.cc

 // 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.
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 252 matching lines @@
 }
 
 RenderViewHost* RenderFrameHostImpl::GetRenderViewHost() {
   return render_view_host_;
 }
 
 ServiceRegistry* RenderFrameHostImpl::GetServiceRegistry() {
   return service_registry_.get();
 }
 
+blink::WebPageVisibilityState RenderFrameHostImpl::GetVisibilityState() {
+  blink::WebPageVisibilityState visibility_state =
+      RenderWidgetHostImpl::From(GetView()->GetRenderWidgetHost())->is_hidden()
+          ? blink::WebPageVisibilityStateHidden
+          : blink::WebPageVisibilityStateVisible;
+  GetContentClient()->browser()->OverridePageVisibilityState(this,
+                                                             &visibility_state);
+  return visibility_state;
+}
+
 bool RenderFrameHostImpl::Send(IPC::Message* message) {
   if (IPC_MESSAGE_ID_CLASS(message->type()) == InputMsgStart) {
     return render_view_host_->input_router()->SendInput(
         make_scoped_ptr(message));
   }
 
   return GetProcess()->Send(message);
 }
 
 bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
@@ skipping 1452 matching lines @@
 void RenderFrameHostImpl::DidUseGeolocationPermission() {
   RenderFrameHost* top_frame = frame_tree_node()->frame_tree()->GetMainFrame();
   GetContentClient()->browser()->RegisterPermissionUsage(
       PERMISSION_GEOLOCATION,
       delegate_->GetAsWebContents(),
       GetLastCommittedURL().GetOrigin(),
       top_frame->GetLastCommittedURL().GetOrigin());
 }
 
 }  // namespace content