Add layerTreeBuildHelper to control layer tree in ContentViewRenderView

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 275 matching lines @@
     'browser/android/in_process/synchronous_compositor_factory_impl.cc',
     'browser/android/in_process/synchronous_compositor_factory_impl.h',
     'browser/android/in_process/synchronous_compositor_impl.cc',
     'browser/android/in_process/synchronous_compositor_impl.h',
     'browser/android/in_process/synchronous_compositor_output_surface.cc',
     'browser/android/in_process/synchronous_compositor_output_surface.h',
     'browser/android/in_process/synchronous_input_event_filter.cc',
     'browser/android/in_process/synchronous_input_event_filter.h',
     'browser/android/interstitial_page_delegate_android.cc',
     'browser/android/interstitial_page_delegate_android.h',
+    'browser/android/layer_tree_build_helper.cc',
+    'browser/android/layer_tree_build_helper.h',
     'browser/android/load_url_params.cc',
     'browser/android/load_url_params.h',
     'browser/android/overscroll_glow.h',
     'browser/android/overscroll_glow.cc',
     'browser/android/popup_item_type_list.h',
     'browser/android/surface_texture_peer_browser_impl.cc',
     'browser/android/surface_texture_peer_browser_impl.h',
     'browser/android/tracing_controller_android.cc',
     'browser/android/tracing_controller_android.h',
     'browser/android/web_contents_observer_android.cc',
@@ skipping 1450 matching lines @@
         '../build/linux/system.gyp:dbus',
         '../dbus/dbus.gyp:dbus',
       ],
     }, {  # OS != "linux" or use_dbus==0
       'sources!': [
         'browser/geolocation/wifi_data_provider_linux.cc',
       ],
     }],
   ],
 }