mus: Add EventObserver to allow passively listening to UI events

components/mus/ws/test_change_tracker.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 COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_
 #define COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 18 matching lines @@
   CHANGE_TYPE_NODE_ADD_TRANSIENT_WINDOW,
   CHANGE_TYPE_NODE_BOUNDS_CHANGED,
   CHANGE_TYPE_NODE_VIEWPORT_METRICS_CHANGED,
   CHANGE_TYPE_NODE_HIERARCHY_CHANGED,
   CHANGE_TYPE_NODE_REMOVE_TRANSIENT_WINDOW_FROM_PARENT,
   CHANGE_TYPE_NODE_REORDERED,
   CHANGE_TYPE_NODE_VISIBILITY_CHANGED,
   CHANGE_TYPE_NODE_DRAWN_STATE_CHANGED,
   CHANGE_TYPE_NODE_DELETED,
   CHANGE_TYPE_INPUT_EVENT,
+  CHANGE_TYPE_EVENT_OBSERVED,
   CHANGE_TYPE_PROPERTY_CHANGED,
   CHANGE_TYPE_FOCUSED,
   CHANGE_TYPE_CURSOR_CHANGED,
   CHANGE_TYPE_ON_CHANGE_COMPLETED,
   CHANGE_TYPE_ON_TOP_LEVEL_CREATED,
   CHANGE_TYPE_OPACITY,
 };
 
 // TODO(sky): consider nuking and converting directly to WindowData.
 struct TestWindow {
@@ skipping 101 matching lines @@
                                 Id new_parent_id,
                                 mojo::Array<mojom::WindowDataPtr> windows);
   void OnWindowReordered(Id window_id,
                          Id relative_window_id,
                          mojom::OrderDirection direction);
   void OnWindowDeleted(Id window_id);
   void OnWindowVisibilityChanged(Id window_id, bool visible);
   void OnWindowOpacityChanged(Id window_id, float opacity);
   void OnWindowParentDrawnStateChanged(Id window_id, bool drawn);
   void OnWindowInputEvent(Id window_id, mojom::EventPtr event);
+  void OnEventObserved(mojom::EventPtr event);
   void OnWindowSharedPropertyChanged(Id window_id,
                                      mojo::String name,
                                      mojo::Array<uint8_t> data);
   void OnWindowFocused(Id window_id);
   void OnWindowPredefinedCursorChanged(Id window_id, mojom::Cursor cursor_id);
   void OnChangeCompleted(uint32_t change_id, bool success);
   void OnTopLevelCreated(uint32_t change_id,
                          mojom::WindowDataPtr window_data,
                          bool drawn);
 
  private:
   void AddChange(const Change& change);
 
   Delegate* delegate_;
   std::vector<Change> changes_;
 
   DISALLOW_COPY_AND_ASSIGN(TestChangeTracker);
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_