Expose whether a frame is focused 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 1522 matching lines @@
 void RenderFrameHostImpl::InvalidateMojoConnection() {
 #if defined(OS_ANDROID)
   // The Android-specific service registry has a reference to
   // |service_registry_| and thus must be torn down first.
   service_registry_android_.reset();
 #endif
 
   service_registry_.reset();
 }
 
+bool RenderFrameHostImpl::IsFocused() {
+  return GetView()->HasFocus() &&
+         frame_tree_->GetFocusedFrame() &&
+         (frame_tree_->GetFocusedFrame() == frame_tree_node() ||
+          frame_tree_->GetFocusedFrame()->IsDescendantOf(frame_tree_node()));
+}
+
 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