Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_touch_pointer.h

 // Copyright 2015 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_TOUCH_POINTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCH_POINTER_H_
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/input/synthetic_pointer.h"
 #include "content/common/content_export.h"
@@ skipping 16 matching lines @@
             const base::TimeTicks& timestamp) override;
   void Move(int index,
             float x,
             float y,
             SyntheticGestureTarget* target,
             const base::TimeTicks& timestamp) override;
   void Release(int index,
                SyntheticGestureTarget* target,
                const base::TimeTicks& timestamp) override;
 
+  SyntheticGestureParams::GestureSourceType PointerSourceType() const override;
+
  private:
   SyntheticWebTouchEvent touch_event_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticTouchPointer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_INPUT_SYNTHETIC_TOUCH_POINTER_H_