Implement cursor compositing mode on Ash

ash/shell.h

 // 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 519 matching lines @@
 
   bool is_touch_hud_projection_enabled() const {
     return is_touch_hud_projection_enabled_;
   }
 
 #if defined(OS_CHROMEOS)
   // Creates instance of FirstRunHelper. Caller is responsible for deleting
   // returned object.
   ash::FirstRunHelper* CreateFirstRunHelper();
 
+  // Toggles cursor compositing on/off. Native cursor is disabled when cursor
+  // compositing is enabled, and vice versa.
+  void SetCursorCompositingEnabled(bool enabled);
+
   StickyKeysController* sticky_keys_controller() {
     return sticky_keys_controller_.get();
   }
 #endif  // defined(OS_CHROMEOS)
 
   GPUSupport* gpu_support() { return gpu_support_.get(); }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtendedDesktopTest, TestCursor);
   FRIEND_TEST_ALL_PREFIXES(WindowManagerTest, MouseEventCursors);
@@ skipping 165 matching lines @@
 
   // Injected content::GPUDataManager support.
   scoped_ptr<GPUSupport> gpu_support_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_