use enum to specify deviceSource for fling animation.

content/browser/renderer_host/input/gesture_event_queue.cc

Index: content/browser/renderer_host/input/gesture_event_queue.cc
diff --git a/content/browser/renderer_host/input/gesture_event_queue.cc b/content/browser/renderer_host/input/gesture_event_queue.cc
index 9811e7357e1782e91bb64ff82a8b7f48fb0cb9dd..5b043e847dedd187555a0245cbc653cf7365787e 100644
--- a/content/browser/renderer_host/input/gesture_event_queue.cc
+++ b/content/browser/renderer_host/input/gesture_event_queue.cc
@@ -103,9 +103,9 @@ bool GestureEventQueue::ShouldForward(
 bool GestureEventQueue::ShouldForwardForZeroVelocityFlingStart(
     const GestureEventWithLatencyInfo& gesture_event) const {
   return gesture_event.event.type != WebInputEvent::GestureFlingStart ||
-      gesture_event.event.sourceDevice != WebGestureEvent::Touchpad ||
-      gesture_event.event.data.flingStart.velocityX != 0 ||
-      gesture_event.event.data.flingStart.velocityY != 0;
+         gesture_event.event.sourceDevice != blink::WebGestureDeviceTouchpad ||
+         gesture_event.event.data.flingStart.velocityX != 0 ||
+         gesture_event.event.data.flingStart.velocityY != 0;
 }
 
 bool GestureEventQueue::ShouldForwardForGFCFiltering(
@@ -118,7 +118,7 @@ bool GestureEventQueue::ShouldForwardForTapSuppression(
     const GestureEventWithLatencyInfo& gesture_event) {
   switch (gesture_event.event.type) {
     case WebInputEvent::GestureFlingCancel:
-      if (gesture_event.event.sourceDevice == WebGestureEvent::Touchscreen)
+      if (gesture_event.event.sourceDevice == blink::WebGestureDeviceTouchpad)
         touchscreen_tap_suppression_controller_.GestureFlingCancel();
       else
         touchpad_tap_suppression_controller_.GestureFlingCancel();
@@ -129,7 +129,7 @@ bool GestureEventQueue::ShouldForwardForTapSuppression(
     case WebInputEvent::GestureTapCancel:
     case WebInputEvent::GestureTap:
     case WebInputEvent::GestureDoubleTap:
-      if (gesture_event.event.sourceDevice == WebGestureEvent::Touchscreen) {
+      if (gesture_event.event.sourceDevice == blink::WebGestureDeviceTouchpad) {
         return !touchscreen_tap_suppression_controller_.FilterTapEvent(
             gesture_event);
       }
@@ -191,7 +191,8 @@ void GestureEventQueue::ProcessGestureAck(InputEventAckState ack_result,
 
   const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
   if (type == WebInputEvent::GestureFlingCancel) {
-    if (event_with_latency.event.sourceDevice == WebGestureEvent::Touchscreen)
+    if (event_with_latency.event.sourceDevice ==
+        blink::WebGestureDeviceTouchpad)
       touchscreen_tap_suppression_controller_.GestureFlingCancelAck(processed);
     else
       touchpad_tap_suppression_controller_.GestureFlingCancelAck(processed);