Refactored GLContext to own GPUTiming which spawn GPUTimingClients.

ui/gl/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 74 matching lines @@
     "gl_surface_osmesa.h",
     "gl_surface_stub.cc",
     "gl_surface_stub.h",
     "gl_surface_win.cc",
     "gl_switches.cc",
     "gl_switches.h",
     "gl_version_info.cc",
     "gl_version_info.h",
     "gpu_switching_manager.cc",
     "gpu_switching_manager.h",
+    "gpu_timing.cc",
+    "gpu_timing.h",
     "scoped_binders.cc",
     "scoped_binders.h",
     "scoped_make_current.cc",
     "scoped_make_current.h",
     "sync_control_vsync_provider.cc",
     "sync_control_vsync_provider.h",
   ]
 
   defines = [ "GL_IMPLEMENTATION" ]
 
@@ skipping 172 matching lines @@
     deps = [
       ":surface_jni_headers",
     ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }