Remove PlatformMouseEvent and use WebMouseEvent instead

third_party/WebKit/public/platform/WebInputEvent.h

 /*
  * Copyright (C) 2009 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 169 matching lines @@
     IsTouchAccessibility = 1 << 13,
 
     IsComposing = 1 << 14,
 
     AltGrKey = 1 << 15,
     FnKey = 1 << 16,
     SymbolKey = 1 << 17,
 
     ScrollLockOn = 1 << 18,
 
+    // Whether this is a compatibility event generated due to a
+    // native touch event. Mouse events generated from touch
+    // events will this.

[bokan, 2017/01/27 16:57:17]

nit: "will set this"

[dtapuska, 2017/01/27 21:00:00]

Done.

+    IsCompatibilityEventForTouch = 1 << 19,
+
     // The set of non-stateful modifiers that specifically change the
     // interpretation of the key being pressed. For example; IsLeft,
     // IsRight, IsComposing don't change the meaning of the key
     // being pressed. NumLockOn, ScrollLockOn, CapsLockOn are stateful
     // and don't indicate explicit depressed state.
     KeyModifiers =
         SymbolKey | FnKey | AltGrKey | MetaKey | AltKey | ControlKey | ShiftKey,
     NoModifiers = 0,
   };
 
@@ skipping 132 matching lines @@
   unsigned m_size;            // The size of this structure, for serialization.
   Type m_type;
   int m_modifiers;
 };
 
 #pragma pack(pop)
 
 }  // namespace blink
 
 #endif