Consuming a touch move prevents only the next scroll update.

content/browser/renderer_host/input/input_router_impl.cc

Index: content/browser/renderer_host/input/input_router_impl.cc
diff --git a/content/browser/renderer_host/input/input_router_impl.cc b/content/browser/renderer_host/input/input_router_impl.cc
index e91c904f0c47d599e4d6b7a04a7ccb23181f01d8..16e0419fda3b0318412ed8b83b6535e749c461cb 100644
--- a/content/browser/renderer_host/input/input_router_impl.cc
+++ b/content/browser/renderer_host/input/input_router_impl.cc
@@ -109,6 +109,20 @@ const char* GetEventAckName(InputEventAckState ack_result) {
   return "";
 }
 
+TouchEventQueue::TouchScrollingMode GetTouchScrollingMode()
+{
+  std::string modeString = CommandLine::ForCurrentProcess()->
+      GetSwitchValueASCII(switches::kTouchScrollingMode);
+  if (modeString == switches::kTouchScrollingModeSyncTouchmove)
+    return TouchEventQueue::TOUCH_SCROLLING_MODE_SYNC_TOUCHMOVE;
+  if (modeString == switches::kTouchScrollingModeAbsorbTouchmove)
+    return TouchEventQueue::TOUCH_SCROLLING_MODE_ABSORB_TOUCHMOVE;
+  if (modeString != "" &&
+      modeString != switches::kTouchScrollingModeTouchcancel)
+    LOG(ERROR) << "Invalid --touch-scrolling-mode option: " << modeString;
+  return TouchEventQueue::TOUCH_SCROLLING_MODE_TOUCHCANCEL;
+}
+
 } // namespace
 
 InputRouterImpl::InputRouterImpl(IPC::Sender* sender,
@@ -130,7 +144,7 @@ InputRouterImpl::InputRouterImpl(IPC::Sender* sender,
   DCHECK(sender);
   DCHECK(client);
   DCHECK(ack_handler);
-  touch_event_queue_.reset(new TouchEventQueue(this));
+  touch_event_queue_.reset(new TouchEventQueue(this, GetTouchScrollingMode()));
   touch_ack_timeout_enabled_ =
       GetTouchAckTimeoutDelayMs(&touch_ack_timeout_delay_ms_);
   touch_event_queue_->SetAckTimeoutEnabled(touch_ack_timeout_enabled_,
@@ -328,6 +342,7 @@ void InputRouterImpl::OnTouchEventAck(const TouchEventWithLatencyInfo& event,
 void InputRouterImpl::OnGestureEventAck(
     const GestureEventWithLatencyInfo& event,
     InputEventAckState ack_result) {
+  touch_event_queue_->OnGestureEventAck(event, ack_result);
   ProcessAckForOverscroll(event.event, ack_result);
   ack_handler_->OnGestureEventAck(event, ack_result);
 }