Redefined the bit WebTouchEvent.causesScrollingIfUncanceled.

third_party/WebKit/public/web/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 564 matching lines @@
     enum { touchesLengthCap = 16 };
 
     unsigned touchesLength;
     // List of all touches, regardless of state.
     WebTouchPoint touches[touchesLengthCap];
 
     // Whether the event can be canceled (with preventDefault). If true then the browser
     // must wait for an ACK for this event. If false then no ACK IPC is expected.
     bool cancelable;
 
-    // Whether the event will produce scroll-inducing events if uncanceled. This
-    // will be true for touchmove events after the platform slop region has been
-    // exceeded and fling-generating touchend events. Note that this doesn't
-    // necessarily mean content will scroll, only that scroll events will be
-    // generated.
-    bool causesScrollingIfUncanceled;
+    // For a single touch, this is true after the touch-point has moved beyond
+    // the platform slop region. For a multitouch, this is true after any
+    // touch-point has moved (by whatever amount).
+    bool movedBeyondSlopRegion;
 
     // A unique identifier for the touch event.
     uint32_t uniqueTouchEventId;
 
     WebTouchEvent()
         : WebInputEvent(sizeof(WebTouchEvent))
         , touchesLength(0)
         , cancelable(true)
-        , causesScrollingIfUncanceled(false)
+        , movedBeyondSlopRegion(false)
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif