Enable browser process hit testing on Android

ui/android/delegated_frame_host_android.cc

 // Copyright 2016 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 "ui/android/delegated_frame_host_android.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "cc/layers/solid_color_layer.h"
@@ skipping 187 matching lines @@
 void DelegatedFrameHostAndroid::ReturnResources(
     const cc::ReturnedResourceArray& resources) {
   client_->ReturnResources(resources);
 }
 
 void DelegatedFrameHostAndroid::SetBeginFrameSource(
     cc::BeginFrameSource* begin_frame_source) {
   client_->SetBeginFrameSource(begin_frame_source);
 }
 
+cc::SurfaceId DelegatedFrameHostAndroid::SurfaceId() const {
+  return cc::SurfaceId(frame_sink_id_, current_frame_->local_surface_id);
+}
+
 }  // namespace ui