mash: Don't synthesize extra key press events in the window server

ui/ozone/public/ozone_platform.h

 // Copyright 2014 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 UI_OZONE_PUBLIC_OZONE_PLATFORM_H_
 #define UI_OZONE_PUBLIC_OZONE_PLATFORM_H_
 
 #include <memory>
 
+#include "base/auto_reset.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/ozone/ozone_export.h"
 
 namespace display {
 class NativeDisplayDelegate;
 }
 
 namespace gfx {
 class Rect;
@@ skipping 99 matching lines @@
   // internal functionality. Embedders wishing to take advantage of ozone mojo
   // implementations must invoke AddInterfaces with a valid
   // service_manager::InterfaceRegistry* pointer to export all Mojo interfaces
   // defined within Ozone.
   //
   // A default do-nothing implementation is provided to permit platform
   // implementations to opt out of implementing any Mojo interfaces.
   virtual void AddInterfaces(service_manager::InterfaceRegistry* registry);
 
  private:
+  friend class ScopedOzonePlatformForTesting;
+
   virtual void InitializeUI(const InitParams& params) = 0;
   virtual void InitializeGPU(const InitParams& params) = 0;
 
   static OzonePlatform* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatform);
 };
 
+// Allows the ozone platform instance to be overridden in tests.
+class OZONE_EXPORT ScopedOzonePlatformForTesting {
+ public:
+  ScopedOzonePlatformForTesting(OzonePlatform* test_instance);
+  ~ScopedOzonePlatformForTesting();
+
+ private:
+  base::AutoReset<OzonePlatform*> auto_reset_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedOzonePlatformForTesting);
+};
+
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_OZONE_PLATFORM_H_