Updates PointerEventRouter to handle switching move type

services/ui/ws/window_tree.h

 // Copyright 2014 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 SERVICES_UI_WS_WINDOW_TREE_H_
 #define SERVICES_UI_WS_WINDOW_TREE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 359 matching lines @@
   void ReorderWindow(uint32_t change_Id,
                      Id window_id,
                      Id relative_window_id,
                      mojom::OrderDirection direction) override;
   void GetWindowTree(
       Id window_id,
       const base::Callback<void(mojo::Array<mojom::WindowDataPtr>)>& callback)
       override;
   void SetCapture(uint32_t change_id, Id window_id) override;
   void ReleaseCapture(uint32_t change_id, Id window_id) override;
-  void StartPointerWatcher(bool want_moves,
-                           uint32_t pointer_watcher_id) override;
+  void StartPointerWatcher(bool want_moves) override;
   void StopPointerWatcher() override;
   void SetWindowBounds(uint32_t change_id,
                        Id window_id,
                        const gfx::Rect& bounds) override;
   void SetWindowVisibility(uint32_t change_id,
                            Id window_id,
                            bool visible) override;
   void SetWindowProperty(uint32_t change_id,
                          Id transport_window_id,
                          const mojo::String& name,
@@ skipping 99 matching lines @@
   uint32_t event_ack_id_;
 
   // A client is considered janky if it hasn't ACK'ed input events within a
   // reasonable timeframe.
   bool janky_ = false;
 
   // For performance reasons, only send move events if the client explicitly
   // requests them.
   bool pointer_watcher_want_moves_ = false;
 
-  // The ID supplied by the client for the current pointer watcher.
-  uint32_t pointer_watcher_id_ = 0;
+  // True if StartPointerWatcher() was called.
+  bool has_pointer_watcher_ = false;
 
   // WindowManager the current event came from.
   WindowManagerState* event_source_wms_ = nullptr;
 
   std::queue<std::unique_ptr<TargetedEvent>> event_queue_;
 
   std::unique_ptr<mojo::AssociatedBinding<mojom::WindowManagerClient>>
       window_manager_internal_client_binding_;
   mojom::WindowManager* window_manager_internal_;
   std::unique_ptr<WindowManagerState> window_manager_state_;
 
   std::unique_ptr<WaitingForTopLevelWindowInfo>
       waiting_for_top_level_window_info_;
   bool embedder_intercepts_events_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTree);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_TREE_H_