Add pointer id to the WebMouseEvent's constructors

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 260 matching lines @@
     kRailsModeFree = 0,
     kRailsModeHorizontal = 1,
     kRailsModeVertical = 2,
   };
 
   static const int kInputModifiers =
       kShiftKey | kControlKey | kAltKey | kMetaKey;
 
   static constexpr double kTimeStampForTesting = 123.0;
 
+  static const int32_t kMousePointerId = std::numeric_limits<int32_t>::max();

[dtapuska, 2017/05/01 15:49:05]

Use constexpr.

Should this be in WebMouseEvent.h?

[lanwei, 2017/05/01 23:51:21]

Done.

+
   // Returns true if the WebInputEvent |type| is a mouse event.
   static bool IsMouseEventType(int type) {
     return kMouseTypeFirst <= type && type <= kMouseTypeLast;
   }
 
   // Returns true if the WebInputEvent |type| is a keyboard event.
   static bool IsKeyboardEventType(int type) {
     return kKeyboardTypeFirst <= type && type <= kKeyboardTypeLast;
   }
 
@@ skipping 132 matching lines @@
   unsigned size_;              // The size of this structure, for serialization.
   Type type_;
   int modifiers_;
 };
 
 #pragma pack(pop)
 
 }  // namespace blink
 
 #endif