Move WebMouseEvent into its own header file.

third_party/WebKit/public/platform/WebMouseEvent.h

Index: third_party/WebKit/public/platform/WebMouseEvent.h
diff --git a/third_party/WebKit/public/platform/WebMouseEvent.h b/third_party/WebKit/public/platform/WebMouseEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..ec23a72f442ff2b38d364fd209ec010d1f54cd99
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebMouseEvent.h
@@ -0,0 +1,67 @@
+// 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 WebMouseEvent_h
+#define WebMouseEvent_h
+
+#include "WebInputEvent.h"
+
+namespace blink {
+
+// See WebInputEvent.h for details why this pack is here.
+#pragma pack(push, 4)
+
+// WebMouseEvent --------------------------------------------------------------
+
+class WebMouseEvent : public WebInputEvent, public WebPointerProperties {
+ public:
+  // Renderer coordinates. Similar to viewport coordinates but without
+  // DevTools emulation transform or overscroll applied. i.e. the coordinates
+  // in Chromium's RenderView bounds.
+  int x;
+  int y;
+
+  // DEPRECATED (crbug.com/507787)
+  int windowX;
+  int windowY;
+
+  // Screen coordinate
+  int globalX;
+  int globalY;
+
+  int movementX;
+  int movementY;
+  int clickCount;
+
+  WebMouseEvent(Type type, int modifiers, double timeStampSeconds)
+      : WebInputEvent(sizeof(WebMouseEvent), type, modifiers, timeStampSeconds),
+        WebPointerProperties() {}
+
+  WebMouseEvent()
+      : WebInputEvent(sizeof(WebMouseEvent)), WebPointerProperties() {}
+
+#if INSIDE_BLINK
+  BLINK_PLATFORM_EXPORT WebFloatPoint movementInRootFrame() const;
+  BLINK_PLATFORM_EXPORT WebFloatPoint positionInRootFrame() const;
+#endif
+
+ protected:
+  explicit WebMouseEvent(unsigned sizeParam)
+      : WebInputEvent(sizeParam), WebPointerProperties() {}
+
+  WebMouseEvent(unsigned sizeParam,
+                Type type,
+                int modifiers,
+                double timeStampSeconds)
+      : WebInputEvent(sizeParam, type, modifiers, timeStampSeconds),
+        WebPointerProperties() {}
+
+  void flattenTransformSelf();
+};
+
+#pragma pack(pop)
+
+}  // namespace blink
+
+#endif  // WebMouseEvent_h