Reland: Implement Aura side of unified touch text selection for contents

ui/touch_selection/touch_handle.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_TOUCH_SELECTION_TOUCH_HANDLE_H_
 #define UI_TOUCH_SELECTION_TOUCH_HANDLE_H_
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
@@ skipping 77 matching lines @@
 
   // Ticks an active animation, as requested to the client by |SetNeedsAnimate|.
   // Returns true if an animation is active and requires further ticking.
   bool Animate(base::TimeTicks frame_time);
 
   bool is_dragging() const { return is_dragging_; }
   const gfx::PointF& position() const { return position_; }
   TouchHandleOrientation orientation() const { return orientation_; }
 
  private:
+  friend class TouchSelectionControllerAuraTest;

[jdduke (slow), 2015/01/28 16:35:32]

Hmm, this friend declaration is a shame, I guess the alternative is having the
client return a drawable with some shared state?

[mohsen, 2015/02/22 23:23:09]

Fixed, please take another look.

+
   void BeginDrag();
   void EndDrag();
   void BeginFade();
   void EndFade();
   void SetAlpha(float alpha);
 
+  TouchHandleDrawable* drawable_for_testing() const { return drawable_.get(); }
+
   scoped_ptr<TouchHandleDrawable> drawable_;
 
   TouchHandleClient* const client_;
 
   gfx::PointF position_;
   TouchHandleOrientation orientation_;
   TouchHandleOrientation deferred_orientation_;
 
   gfx::PointF touch_down_position_;
   gfx::Vector2dF touch_to_focus_offset_;
@@ skipping 11 matching lines @@
   bool is_visible_;
   bool is_dragging_;
   bool is_drag_within_tap_region_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchHandle);
 };
 
 }  // namespace ui
 
 #endif  // UI_TOUCH_SELECTION_TOUCH_HANDLE_H_