Fix the double-tap to click gesture in touch accessibility mode.

ash/root_window_controller.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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 211 matching lines @@
 
   // Activate virtual keyboard on current root window controller.
   void ActivateKeyboard(keyboard::KeyboardController* keyboard_controller);
 
   // Deactivate virtual keyboard on current root window controller.
   void DeactivateKeyboard(keyboard::KeyboardController* keyboard_controller);
 
   // Tests if a window is associated with the virtual keyboard.
   bool IsVirtualKeyboardWindow(aura::Window* window);
 
+  // If touch exploration is enabled, update the touch exploration
+  // controller so that synthesized touch events are anchored at this point.
+  void SetTouchAccessibilityAnchorPoint(const gfx::Point& anchor_point);
+
  private:
   explicit RootWindowController(AshWindowTreeHost* host);
   enum RootWindowType {
     PRIMARY,
     SECONDARY
   };
 
   // Initializes the RootWindowController.  |is_primary| is true if
   // the controller is for primary display.  |first_run_after_boot| is
   // set to true only for primary root window after boot.
@@ skipping 77 matching lines @@
 
 // On classic ash, returns the RootWindowController for the given |root_window|.
 // On mus ash, returns the RootWindowController for the primary display.
 // See RootWindowController class comment above.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_