Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 20 matching lines @@
  public:
   SyntheticGesture();
   virtual ~SyntheticGesture();
 
   static std::unique_ptr<SyntheticGesture> Create(
       const SyntheticGestureParams& gesture_params);
 
   enum Result {
     GESTURE_RUNNING,
     GESTURE_FINISHED,
+    POINTER_ACTION_PROCESSED,

[tdresser, 2016/05/13 13:58:04]

Maybe add a comment describing what's different about finished and processed? Or
give them more specific names.

[lanwei, 2016/05/19 16:04:12]

Done.

+    POINTER_ACTION_FINISHED,
     GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED,
     GESTURE_RESULT_MAX = GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED
   };
 
   // Update the state of the gesture and forward the appropriate events to the
   // platform. This function is called repeatedly by the synthetic gesture
   // controller until it stops returning GESTURE_RUNNING.
   virtual Result ForwardInputEvents(
       const base::TimeTicks& timestamp, SyntheticGestureTarget* target) = 0;
 
  protected:
   DISALLOW_COPY_AND_ASSIGN(SyntheticGesture);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_