Modify gesture event types for WebView-tag scroll bubbling.

public/web/WebInputEvent.h

Index: public/web/WebInputEvent.h
diff --git a/public/web/WebInputEvent.h b/public/web/WebInputEvent.h
index 8751143585fef569c71372998aa575a9937d0101..2b92d873fdc277b25235005952396d377dbe9678 100644
--- a/public/web/WebInputEvent.h
+++ b/public/web/WebInputEvent.h
@@ -373,6 +373,8 @@ public:
     float accelerationRatioX;
     float accelerationRatioY;
 
+    int resendSource;
+
     Phase phase;
     Phase momentumPhase;
 
@@ -412,6 +414,7 @@ public:
         , wheelTicksY(0.0f)
         , accelerationRatioX(1.0f)
         , accelerationRatioY(1.0f)
+        , resendSource(0)
         , phase(PhaseNone)
         , momentumPhase(PhaseNone)
         , canRubberbandLeft(true)
@@ -433,6 +436,7 @@ public:
     int globalX;
     int globalY;
     WebGestureDevice sourceDevice;
+    int resendSource;
 
     union {
         // Tap information must be set for GestureTap, GestureTapUnconfirmed,
@@ -514,6 +518,7 @@ public:
         , y(0)
         , globalX(0)
         , globalY(0)
+        , resendSource(0)
     {
         memset(&data, 0, sizeof(data));
     }