Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_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_POINTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 22 matching lines @@
                     const base::TimeTicks& timestamp) = 0;
   virtual void Move(int index,
                     float x,
                     float y,
                     SyntheticGestureTarget* target,
                     const base::TimeTicks& timestamp) = 0;
   virtual void Release(int index,
                        SyntheticGestureTarget* target,
                        const base::TimeTicks& timestamp) = 0;
 
+  virtual SyntheticGestureParams::GestureSourceType PointerSourceType()
+      const = 0;
+
  protected:
   static double ConvertTimestampToSeconds(const base::TimeTicks& timestamp);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyntheticPointer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_H_