zero-copy: Clarify to allocate/destroy GpuMemoryBuffer on any thread and use it on the main thread o

ui/ozone/platform/test/test_window_manager.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_TEST_FILE_SURFACE_FACTORY_H_
 #define UI_OZONE_PLATFORM_TEST_FILE_SURFACE_FACTORY_H_
 
 #include "base/files/file_path.h"
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/test/test_window.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
 namespace ui {
 
 class TestWindowManager : public SurfaceFactoryOzone {
  public:
   explicit TestWindowManager(const base::FilePath& dump_location);
   ~TestWindowManager() override;
@@ skipping 14 matching lines @@
   scoped_ptr<SurfaceOzoneCanvas> CreateCanvasForWidget(
       gfx::AcceleratedWidget w) override;
   bool LoadEGLGLES2Bindings(
       AddGLLibraryCallback add_gl_library,
       SetGLGetProcAddressProcCallback set_gl_get_proc_address) override;
 
  private:
   base::FilePath location_;
 
   IDMap<TestWindow> windows_;
+  base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWindowManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_TEST_FILE_SURFACE_FACTORY_H_