Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture_controller.cc

 // Copyright 2013 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_gesture_controller.h"
 
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
@@ skipping 17 matching lines @@
   bool was_empty = pending_gesture_queue_.IsEmpty();
 
   pending_gesture_queue_.Push(std::move(synthetic_gesture),
                               completion_callback);
 
   if (was_empty)
     StartGesture(*pending_gesture_queue_.FrontGesture());
 }
 
 void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
+  LOG(ERROR) << "SyntheticGestureController::Flush "
+             << pending_gesture_queue_.IsEmpty();
   TRACE_EVENT0("input", "SyntheticGestureController::Flush");
   if (pending_gesture_queue_.IsEmpty())
     return;
 
   if (pending_gesture_result_)
     return;
 
   SyntheticGesture* gesture = pending_gesture_queue_.FrontGesture();
   SyntheticGesture::Result result =
       gesture->ForwardInputEvents(timestamp, gesture_target_.get());
@@ skipping 38 matching lines @@
     const OnGestureCompleteCallback& completion_callback,
     SyntheticGesture::Result result) {
   DCHECK_NE(result, SyntheticGesture::GESTURE_RUNNING);
   TRACE_EVENT_ASYNC_END0("input,benchmark",
                          "SyntheticGestureController::running",
                          &gesture);
 
   completion_callback.Run(result);
 }
 
+SyntheticGestureParams::GestureSourceType
+SyntheticGestureController::GetDefaultSyntheticGestureSourceType() {
+  return gesture_target_->GetDefaultSyntheticGestureSourceType();
+}
+
 SyntheticGestureController::GestureAndCallbackQueue::GestureAndCallbackQueue() {
 }
 
 SyntheticGestureController::GestureAndCallbackQueue::
     ~GestureAndCallbackQueue() {
 }
 
 }  // namespace content