Make SyntheticPointerAction to flush the pointer action sequence

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index fde38b4ccd86bfdf1b97442ac82f4ee70f496363..f9bb07246f13c3bc556a76725809aa1840e10009 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1184,14 +1184,13 @@ void RenderWidgetHostImpl::ForwardKeyboardEvent(
 void RenderWidgetHostImpl::QueueSyntheticGesture(
     std::unique_ptr<SyntheticGesture> synthetic_gesture,
     const base::Callback<void(SyntheticGesture::Result)>& on_complete) {
-  if (!synthetic_gesture_controller_ && view_) {
-    synthetic_gesture_controller_.reset(
-        new SyntheticGestureController(view_->CreateSyntheticGestureTarget()));
+  if (!synthetic_gesture_controller_) {
+    if(!CreateSyntheticGestureController())
+      return;

[tdresser, 2016/10/31 14:22:58]

Should this ever happen? Should there be a CHECK or DCHECK?

[lanwei, 2016/12/04 18:08:02]

Done.

   }
-  if (synthetic_gesture_controller_) {
-    synthetic_gesture_controller_->QueueSyntheticGesture(
+
+  synthetic_gesture_controller_->QueueSyntheticGesture(
         std::move(synthetic_gesture), on_complete);
-  }
 }
 
 void RenderWidgetHostImpl::SetCursor(const WebCursor& cursor) {
@@ -1746,10 +1745,26 @@ void RenderWidgetHostImpl::OnQueueSyntheticGesture(
     return;
   }
 
+  if (!synthetic_gesture_controller_) {
+    if(!CreateSyntheticGestureController())
+      return;

[tdresser, 2016/10/31 14:22:58]

Should this ever happen?

[lanwei, 2016/12/04 18:08:02]

Done.

+  }
+  std::unique_ptr<SyntheticGesture> synthetic_gesture;
+  const SyntheticGestureParams* gesture_params =
+      gesture_packet.gesture_params();
+  if (gesture_params->GetGestureType() ==
+      SyntheticGestureParams::POINTER_ACTION_LIST) {
+    synthetic_gesture =
+        synthetic_gesture_controller_->CreateSyntheticPointerAction(
+            *SyntheticPointerActionListParams::Cast(gesture_params));
+  } else {
+    synthetic_gesture = SyntheticGesture::Create(*gesture_params);
+  }
+
   QueueSyntheticGesture(
-        SyntheticGesture::Create(*gesture_packet.gesture_params()),
-        base::Bind(&RenderWidgetHostImpl::OnSyntheticGestureCompleted,
-                   weak_factory_.GetWeakPtr()));
+      std::move(synthetic_gesture),
+      base::Bind(&RenderWidgetHostImpl::OnSyntheticGestureCompleted,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void RenderWidgetHostImpl::OnSetCursor(const WebCursor& cursor) {
@@ -2192,6 +2207,17 @@ void RenderWidgetHostImpl::OnSnapshotDataReceivedAsync(
     OnSnapshotDataReceived(snapshot_id, NULL, 0);
 }
 
+bool RenderWidgetHostImpl::CreateSyntheticGestureController() {
+  DCHECK(!synthetic_gesture_controller_);
+
+  if (!view_)
+    return false;
+
+  synthetic_gesture_controller_.reset(
+      new SyntheticGestureController(view_->CreateSyntheticGestureTarget()));
+  return true;
+}
+
 // static
 void RenderWidgetHostImpl::CompositorFrameDrawn(
     const std::vector<ui::LatencyInfo>& latency_info) {