Add pointer id to the WebMouseEvent's constructors

third_party/WebKit/public/platform/WebInputEvent.h

Index: third_party/WebKit/public/platform/WebInputEvent.h
diff --git a/third_party/WebKit/public/platform/WebInputEvent.h b/third_party/WebKit/public/platform/WebInputEvent.h
index ce3730058b06cdc18835cbe5368fbc4d26216ed8..f12868643639ea1a45ea32e31117c98a79ffc016 100644
--- a/third_party/WebKit/public/platform/WebInputEvent.h
+++ b/third_party/WebKit/public/platform/WebInputEvent.h
@@ -278,6 +278,8 @@ class WebInputEvent {
 
   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;