Process DisplaySnapshots in PlatformScreen.

services/ui/ws/display_manager.cc

 // 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.
 
 #include "services/ui/ws/display_manager.h"
 
 #include "base/memory/ptr_util.h"
 #include "services/ui/display/platform_screen.h"
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_binding.h"
@@ skipping 86 matching lines @@
     const ServerWindow* window) const {
   while (window && window->parent())
     window = window->parent();
   for (Display* display : displays_) {
     if (window == display->root_window())
       return display;
   }
   return nullptr;
 }
 
+Display* DisplayManager::GetDisplayById(int64_t display_id) {
+  for (Display* display : displays_) {
+    if (display->GetId() == display_id)
+      return display;
+  }
+  return nullptr;
+}
+
 const WindowManagerDisplayRoot* DisplayManager::GetWindowManagerDisplayRoot(
     const ServerWindow* window) const {
   const ServerWindow* last = window;
   while (window && window->parent()) {
     last = window;
     window = window->parent();
   }
   for (Display* display : displays_) {
     if (window == display->root_window())
       return display->GetWindowManagerDisplayRootWithRoot(last);
@@ skipping 51 matching lines @@
   params.platform_screen = platform_screen;
   params.surfaces_state = window_server_->GetSurfacesState();
 
   ws::Display* display = new ws::Display(window_server_, params);
   display->Init(nullptr);
 
   window_server_->delegate()->UpdateTouchTransforms();
 }
 
 void DisplayManager::OnDisplayRemoved(int64_t id) {
-  // TODO(kylechar): Implement.
-  NOTREACHED();
+  Display* display = GetDisplayById(id);
+  if (display)
+    DestroyDisplay(display);
+  // TODO(kylechar): What if the display is still pending?
 }
 
 void DisplayManager::OnDisplayModified(int64_t id, const gfx::Rect& bounds) {
   // TODO(kylechar): Implement.
   NOTREACHED();
 }
 
 }  // namespace ws
 }  // namespace ui