mus: Add EventObserver to allow passively listening to UI events

components/mus/ws/test_utils.h

 // Copyright 2016 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_UTILS_H_
 #define COMPONENTS_MUS_WS_TEST_UTILS_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 58 matching lines @@
   WindowTreeTestApi(WindowTree* tree);
   ~WindowTreeTestApi();
 
   void set_window_manager_internal(mojom::WindowManager* wm_internal) {
     tree_->window_manager_internal_ = wm_internal;
   }
 
   void ClearAck() { tree_->event_ack_id_ = 0; }
   void EnableCapture() { tree_->event_ack_id_ = 1u; }
 
+  void SetEventObserver(mojom::EventMatcherPtr matcher);
+  void ClearEventObserver();
+
  private:
   WindowTree* tree_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeTestApi);
 };
 
 // -----------------------------------------------------------------------------
 
 class DisplayTestApi {
  public:
@@ skipping 194 matching lines @@
   void OnWindowOpacityChanged(uint32_t window,
                               float old_opacity,
                               float new_opacity) override;
   void OnWindowParentDrawnStateChanged(uint32_t window, bool drawn) override;
   void OnWindowSharedPropertyChanged(uint32_t window,
                                      const mojo::String& name,
                                      mojo::Array<uint8_t> new_data) override;
   void OnWindowInputEvent(uint32_t event_id,
                           uint32_t window,
                           mojom::EventPtr event) override;
+  void OnEventObserved(mojom::EventPtr event) override;
   void OnWindowFocused(uint32_t focused_window_id) override;
   void OnWindowPredefinedCursorChanged(uint32_t window_id,
                                        mojom::Cursor cursor_id) override;
   void OnChangeCompleted(uint32_t change_id, bool success) override;
   void RequestClose(uint32_t window_id) override;
   void GetWindowManager(
       mojo::AssociatedInterfaceRequest<mojom::WindowManager> internal) override;
 
   TestChangeTracker tracker_;
   mojo::Binding<mojom::WindowTreeClient> binding_;
@@ skipping 97 matching lines @@
 
 // Creates a new visible window as a child of the single root of |tree|.
 // |client_id| set to the ClientWindowId of the new window.
 ServerWindow* NewWindowInTree(WindowTree* tree, ClientWindowId* client_id);
 
 }  // namespace test
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_TEST_UTILS_H_