Implement touch exploration touch typing

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 6727c2a5eded9d6faf66f69cc16bfa2c649ddee5..9f833463b13584cb907db780ef73cc1eb0aa6913 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -194,6 +194,10 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // |bounds| are in root window coordinates.
   void SetExcludeBounds(const gfx::Rect& bounds);
 
+  // For touch explore release state that fall within |bounds|, causes a tap to
+  // be synthesized and dispatched to the anchor point.
+  void SetLiftActivationBounds(const gfx::Rect& bounds);
+
  private:
   friend class TouchExplorationControllerTestApi;
 
@@ -298,6 +302,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
 
   void SendSimulatedClick();
 
+  void DispatchSynthesizedTap();
+
   // Some constants used in touch_exploration_controller:
 
   // Within this many dips of the screen edge, the release event generated will
@@ -514,6 +520,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // rewritten when TouchExplorationController is running.
   TouchAccessibilityEnabler* touch_accessibility_enabler_;
 
+  gfx::Rect lift_activation_bounds_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
 };