Make SyntheticPointerAction to flush the pointer action sequence

content/browser/renderer_host/input/synthetic_pointer_driver.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_DRIVER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_DRIVER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
  public:
   SyntheticPointerDriver();
   virtual ~SyntheticPointerDriver();
 
   static std::unique_ptr<SyntheticPointerDriver> Create(
       SyntheticGestureParams::GestureSourceType gesture_source_type);
 
   virtual void DispatchEvent(SyntheticGestureTarget* target,
                              const base::TimeTicks& timestamp) = 0;
 
-  virtual int Press(float x, float y) = 0;
+  virtual void Press(float x, float y, int index = 0) = 0;
   virtual void Move(float x, float y, int index = 0) = 0;
   virtual void Release(int index = 0) = 0;
 
   // Check if the user inputs in the SyntheticPointerActionParams can generate
   // a valid sequence of pointer actions.
   virtual bool UserInputCheck(
       const SyntheticPointerActionParams& params) const = 0;
 
  protected:
   static double ConvertTimestampToSeconds(const base::TimeTicks& timestamp);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyntheticPointerDriver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_DRIVER_H_