chromeos: makes mus send keyevents to display root when nothing has focus

services/ui/ws/display.h

 // Copyright 2015 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_DISPLAY_H_
 #define SERVICES_UI_WS_DISPLAY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 54 matching lines @@
                 public EventSink {
  public:
   explicit Display(WindowServer* window_server);
   ~Display() override;
 
   // Initializes the display root ServerWindow and PlatformDisplay. Adds this to
   // DisplayManager as a pending display, until accelerated widget is available.
   void Init(const display::ViewportMetrics& metrics,
             std::unique_ptr<DisplayBinding> binding);
 
-  // Returns an ID for this display. In internal mode this the display::Display
-  // ID. In external mode this hasn't been defined yet.
+  // Returns the ID for this display. In internal mode this is the
+  // display::Display ID. In external mode this hasn't been defined yet.
   int64_t GetId() const;
 
   // Sets the display::Display corresponding to this ws::Display. This is only
   // valid in internal window mode.
   void SetDisplay(const display::Display& display);
 
   // PlatformDisplayDelegate:
   const display::Display& GetDisplay() override;
 
   DisplayManager* display_manager();
@@ skipping 140 matching lines @@
 
   WindowManagerDisplayRootMap window_manager_display_root_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Display);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_DISPLAY_H_