Implement rudimentary touchscreen support in mus.

components/mus/ws/platform_screen_impl_ozone.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_PLATFORM_SCREEN_IMPL_OZONE_H_
 #define COMPONENTS_MUS_WS_PLATFORM_SCREEN_IMPL_OZONE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 33 matching lines @@
 
   // TODO(rjkroege): NativeDisplayObserver is misnamed as it tracks changes in
   // the physical "Screen".  Consider renaming it to NativeScreenObserver.
   // ui::NativeDisplayObserver:
   void OnConfigurationChanged() override;
 
   // Display management callback.
   void OnDisplaysAquired(const ConfiguredDisplayCallback& callback,
                          const std::vector<ui::DisplaySnapshot*>& displays);
 
+  // The display subsystem calls |OnDisplayConfigured| for each display that has
+  // been successfully configured. This in turn calls |callback_| with the
+  // identity and bounds of each physical display.
+  void OnDisplayConfigured(const ConfiguredDisplayCallback& callback,
+                           int64_t id,
+                           const gfx::Rect& bounds,
+                           bool success);
+
   std::unique_ptr<ui::NativeDisplayDelegate> native_display_delegate_;
 
   base::WeakPtrFactory<PlatformScreenImplOzone> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformScreenImplOzone);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_PLATFORM_SCREEN_IMPL_OZONE_H_