Process DisplaySnapshots in PlatformScreen.

services/ui/ws/display_manager.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 SERVICES_UI_WS_DISPLAY_MANAGER_H_
 #define SERVICES_UI_WS_DISPLAY_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 36 matching lines @@
   std::set<const Display*> displays() const;
 
   // Notifies when something about the Display changes.
   void OnDisplayUpdate(Display* display);
 
   // Returns the Display that contains |window|, or null if |window| is not
   // attached to a display.
   Display* GetDisplayContaining(ServerWindow* window);
   const Display* GetDisplayContaining(const ServerWindow* window) const;
 
+  // Returns the display with the specified display id, or null if there is no
+  // display with that id.
+  Display* GetDisplayById(int64_t display_id);
+
   const WindowManagerDisplayRoot* GetWindowManagerDisplayRoot(
       const ServerWindow* window) const;
   // TODO(sky): constness here is wrong! fix!
   WindowManagerDisplayRoot* GetWindowManagerDisplayRoot(
       const ServerWindow* window);
 
   bool has_displays() const { return !displays_.empty(); }
   bool has_active_or_pending_displays() const {
     return !displays_.empty() || !pending_displays_.empty();
   }
@@ skipping 30 matching lines @@
   // ID to use for next root node.
   ClientSpecificId next_root_id_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_DISPLAY_MANAGER_H_