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 1459 matching lines @@
 
   service_registry_.reset();
 }
 
 bool RenderFrameHostImpl::IsFocused() const {
   return GetRenderWidgetHost()->is_focused() &&
          frame_tree_->GetFocusedFrame() &&
          frame_tree_->GetFocusedFrame()->current_frame_host() == this;
 }
 
+blink::WebPageVisibilityState RenderFrameHostImpl::GetVisibilityState() {
+  if (GetContentClient()->browser()->IsPrerendering(this))
+    return blink::WebPageVisibilityStatePrerender;
+
+  return GetRenderWidgetHost()->is_hidden()
+            ? blink::WebPageVisibilityStateHidden

[Charlie Reis, 2015/01/22 21:03:55]

This indent doesn't seem right.  I would have done 4 spaces past "return", but
I've also seen 4 spaces past "GetRenderWidgetHost()" from clang-format.  This is
3 spaces past.

[mlamouri (slow - plz ping), 2015/01/23 12:32:57]

Fixed.

+            : blink::WebPageVisibilityStateVisible;
+}
+
 void RenderFrameHostImpl::UpdateCrossProcessIframeAccessibility(
     const std::map<int32, int>& node_to_frame_routing_id_map) {
   for (const auto& iter : node_to_frame_routing_id_map) {
     // This is the id of the accessibility node that has a child frame.
     int32 node_id = iter.first;
     // The routing id from either a RenderFrame or a RenderFrameProxy.
     int frame_routing_id = iter.second;
 
     FrameTree* frame_tree = frame_tree_node()->frame_tree();
     FrameTreeNode* child_frame_tree_node = frame_tree->FindByRoutingID(
@@ skipping 158 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