Make event-targeting asynchronous in window server.

services/ui/ws/event_dispatcher.h

Index: services/ui/ws/event_dispatcher.h
diff --git a/services/ui/ws/event_dispatcher.h b/services/ui/ws/event_dispatcher.h
index 193786bd6ee5d119c42684623986a3ce9c612e94..7b4c7824ea0d623c77f2cc1a9fab3f3bedb3edfb 100644
--- a/services/ui/ws/event_dispatcher.h
+++ b/services/ui/ws/event_dispatcher.h
@@ -59,6 +59,8 @@ class EventDispatcher : public ServerWindowObserver, public DragCursorUpdater {
   // any events to the delegate.
   void Reset();
 
+  const EventTargeter* event_targeter() const { return event_targeter_.get(); }
+
   void SetMousePointerDisplayLocation(const gfx::Point& display_location,
                                       const int64_t display_id);
   const gfx::Point& mouse_pointer_last_location() const {
@@ -144,6 +146,8 @@ class EventDispatcher : public ServerWindowObserver, public DragCursorUpdater {
   // ANY and there is a matching accelerator with PRE_TARGET found, than only
   // OnAccelerator() is called. The expectation is after the PRE_TARGET has been
   // handled this is again called with an AcceleratorMatchPhase of POST_ONLY.
+  // This may be asynchronous if we need to find the target window for |event|
+  // asynchronously.
   void ProcessEvent(const ui::Event& event,
                     const int64_t display_id,
                     AcceleratorMatchPhase match_phase);
@@ -170,6 +174,8 @@ class EventDispatcher : public ServerWindowObserver, public DragCursorUpdater {
   // This also generates exit events as appropriate. For example, if the mouse
   // moves between one window to another an exit is generated on the first.
   void ProcessPointerEvent(const ui::PointerEvent& event);
+  void ProcessPointerEventOnFoundTarget(const ui::PointerEvent& event,
+                                        PointerTarget pointer_target_found);
 
   // Adds |pointer_target| to |pointer_targets_|.
   void StartTrackingPointer(int32_t pointer_id,
@@ -182,7 +188,14 @@ class EventDispatcher : public ServerWindowObserver, public DragCursorUpdater {
   // pointer sends the appropriate event to the delegate and updates the
   // currently tracked PointerTarget appropriately.
   void UpdateTargetForPointer(int32_t pointer_id,
-                              const ui::LocatedEvent& event);
+                              const ui::PointerEvent& event,
+                              const PointerTarget& pointer_target_found);
+
+  void UpdateNonClientAreaForCurrentWindowOnFoundWindow(
+      DeepestWindow deepest_window);
+
+  void UpdateCursorProviderByLastKnownLocationOnFoundWindow(
+      DeepestWindow deepest_window);

[sky, 2017/05/30 17:26:02]

const DeepestWindow& here and bove?

[riajiang, 2017/05/31 22:44:03]

Done.

 
   // Returns true if any pointers are in the pressed/down state.
   bool AreAnyPointersDown() const;