Support multi-button press for synthetic mouse events

content/browser/renderer_host/input/synthetic_mouse_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_MOUSE_DRIVER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_MOUSE_DRIVER_H_
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/input/synthetic_pointer_driver.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_web_input_event_builders.h"
 
 namespace content {
 
 class CONTENT_EXPORT SyntheticMouseDriver : public SyntheticPointerDriver {
  public:
   SyntheticMouseDriver();
   ~SyntheticMouseDriver() override;
 
   void DispatchEvent(SyntheticGestureTarget* target,
                      const base::TimeTicks& timestamp) override;
 
-  void Press(float x, float y, int index = 0) override;
+  void Press(float x,
+             float y,
+             int index = 0,
+             SyntheticPointerActionParams::Button button =
+                 SyntheticPointerActionParams::Button::LEFT) override;
   void Move(float x, float y, int index = 0) override;
-  void Release(int index = 0) override;
+  void Release(int index = 0,
+               SyntheticPointerActionParams::Button button =
+                   SyntheticPointerActionParams::Button::LEFT) override;
 
   bool UserInputCheck(
       const SyntheticPointerActionParams& params) const override;
 
  private:
   blink::WebMouseEvent mouse_event_;
+  unsigned last_modifiers_;
+
   DISALLOW_COPY_AND_ASSIGN(SyntheticMouseDriver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_MOUSE_DRIVER_H_