Toolbar is a root layer for the UI compositor

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 734 matching lines @@
       'browser/android/compositor/scene_layer/reader_mode_scene_layer.cc',
       'browser/android/compositor/scene_layer/reader_mode_scene_layer.h',
       'browser/android/compositor/scene_layer/scene_layer.cc',
       'browser/android/compositor/scene_layer/scene_layer.h',
       'browser/android/compositor/scene_layer/static_tab_scene_layer.cc',
       'browser/android/compositor/scene_layer/static_tab_scene_layer.h',
       'browser/android/compositor/scene_layer/tab_list_scene_layer.cc',
       'browser/android/compositor/scene_layer/tab_list_scene_layer.h',
       'browser/android/compositor/scene_layer/tab_strip_scene_layer.cc',
       'browser/android/compositor/scene_layer/tab_strip_scene_layer.h',
+      'browser/android/compositor/scene_layer/toolbar_scene_layer.cc',
+      'browser/android/compositor/scene_layer/toolbar_scene_layer.h',
       'browser/android/compositor/tab_content_manager.cc',
       'browser/android/compositor/tab_content_manager.h',
       'browser/android/contextualsearch/contextual_search_context.cc',
       'browser/android/contextualsearch/contextual_search_context.h',
       'browser/android/contextualsearch/contextual_search_delegate.cc',
       'browser/android/contextualsearch/contextual_search_delegate.h',
       'browser/android/contextualsearch/contextual_search_field_trial.cc',
       'browser/android/contextualsearch/contextual_search_field_trial.h',
       'browser/android/contextualsearch/contextual_search_manager.cc',
       'browser/android/contextualsearch/contextual_search_manager.h',
@@ skipping 1167 matching lines @@
       'android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelContent.java',
       'android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java',
       'android/java/src/org/chromium/chrome/browser/compositor/LayerTitleCache.java',
       'android/java/src/org/chromium/chrome/browser/compositor/layouts/content/TabContentManager.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/ContextualSearchSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/ReaderModeSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/SceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/StaticTabSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabStripSceneLayer.java',
+      'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/ToolbarSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuHelper.java',
       'android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java',
       'android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java',
       'android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchTabHelper.java',
       'android/java/src/org/chromium/chrome/browser/cookies/CookiesFetcher.java',
       'android/java/src/org/chromium/chrome/browser/DevToolsServer.java',
       'android/java/src/org/chromium/chrome/browser/database/SQLiteCursor.java',
       'android/java/src/org/chromium/chrome/browser/datausage/DataUseTabUIManager.java',
       'android/java/src/org/chromium/chrome/browser/datausage/ExternalDataUseObserver.java',
       'android/java/src/org/chromium/chrome/browser/document/DocumentWebContentsDelegate.java',
@@ skipping 2307 matching lines @@
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
             'common',
           ],
         },
       ],
     }],
   ],
 }