Move WebMouseEvent into its own header file.

third_party/WebKit/Source/web/tests/FrameTestHelpers.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FrameTestHelpers_h
 #define FrameTestHelpers_h
 
 #include "core/frame/Settings.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/scroll/ScrollbarTheme.h"
+#include "public/platform/WebMouseEvent.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebFrameOwnerProperties.h"
 #include "public/web/WebHistoryItem.h"
 #include "public/web/WebRemoteFrameClient.h"
 #include "public/web/WebSettings.h"
 #include "public/web/WebViewClient.h"
 #include "web/WebViewImpl.h"
 #include <gmock/gmock.h>
@@ skipping 223 matching lines @@
                           WebDOMMessageEvent) override {}
 
  private:
   Persistent<WebRemoteFrameImpl> const m_frame;
 };
 
 }  // namespace FrameTestHelpers
 }  // namespace blink
 
 #endif  // FrameTestHelpers_h