Make SyntheticPointerAction to flush the pointer action sequence

content/browser/renderer_host/input/synthetic_mouse_driver.cc

 // 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.
 
 #include "content/browser/renderer_host/input/synthetic_mouse_driver.h"
 
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 
 namespace content {
 
 SyntheticMouseDriver::SyntheticMouseDriver() {}
 
 SyntheticMouseDriver::~SyntheticMouseDriver() {}
 
 void SyntheticMouseDriver::DispatchEvent(SyntheticGestureTarget* target,
                                          const base::TimeTicks& timestamp) {
   mouse_event_.timeStampSeconds = ConvertTimestampToSeconds(timestamp);
   target->DispatchInputEventToPlatform(mouse_event_);
 }
 
-int SyntheticMouseDriver::Press(float x, float y) {
+void SyntheticMouseDriver::Press(float x, float y, int index) {
+  DCHECK_EQ(index, 0);

[samuong, 2016/12/20 05:13:26]

is this because only one synthetic mouse pointer is supported? is this
documented anywhere?

[lanwei, 2016/12/20 18:51:47]

Yes, because there is just one mouse cursor, supporting more than one mouses
does not have any point.
I will update the doc to state this. Also we only support one source type in one
sequence right now. Will support multi-input later. I will also include this in
the doc.

   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
       blink::WebInputEvent::MouseDown, x, y, 0);
   mouse_event_.clickCount = 1;
-  return 0;
 }
 
 void SyntheticMouseDriver::Move(float x, float y, int index) {
   DCHECK_EQ(index, 0);
   blink::WebMouseEvent::Button button = mouse_event_.button;
   int click_count = mouse_event_.clickCount;
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
       blink::WebInputEvent::MouseMove, x, y, 0);
   mouse_event_.button = button;
   mouse_event_.clickCount = click_count;
 }
 
 void SyntheticMouseDriver::Release(int index) {
   DCHECK_EQ(index, 0);
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
       blink::WebInputEvent::MouseUp, mouse_event_.x, mouse_event_.y, 0);
   mouse_event_.clickCount = 1;
 }
 
 bool SyntheticMouseDriver::UserInputCheck(
     const SyntheticPointerActionParams& params) const {
-  if (params.gesture_source_type != SyntheticGestureParams::MOUSE_INPUT)
-    return false;
-
+  DCHECK_EQ(params.index(), 0);
   if (params.pointer_action_type() ==
       SyntheticPointerActionParams::PointerActionType::NOT_INITIALIZED) {
     return false;
   }
 
   if (params.pointer_action_type() ==
           SyntheticPointerActionParams::PointerActionType::PRESS &&
       mouse_event_.clickCount > 0) {
     return false;
   }
 
   if (params.pointer_action_type() ==
           SyntheticPointerActionParams::PointerActionType::RELEASE &&
       mouse_event_.clickCount <= 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace content