Consuming a touch move prevents only the next scroll update.

content/browser/renderer_host/input/gesture_event_packet.h

Index: content/browser/renderer_host/input/gesture_event_packet.h
diff --git a/content/browser/renderer_host/input/gesture_event_packet.h b/content/browser/renderer_host/input/gesture_event_packet.h
index 1227417ee86302c6fc6daee6ef39fb76adccd45c..94066a1aafb0b84439e45db66cd03fc1928ace9f 100644
--- a/content/browser/renderer_host/input/gesture_event_packet.h
+++ b/content/browser/renderer_host/input/gesture_event_packet.h
@@ -15,10 +15,14 @@ namespace content {
 class CONTENT_EXPORT GestureEventPacket {
  public:
   enum GestureSource {
-    INVALID = -1,  // Used only for a default-constructed packet..
-    TOUCH_BEGIN,   // The start of a new gesture sequence.
-    TOUCH,         // Continuation of an existing gesture sequence.
-    TOUCH_TIMEOUT, // Timeout from an existing gesture sequence.
+    INVALID = -1,          // Used only for a default-constructed packet.
+    OUT_OF_ORDER,          // The source of the gesture was out of order.
+    TOUCH_SEQUENCE_BEGIN,  // The start of a new gesture sequence.
+    TOUCH_SEQUENCE_END,    // The end of gesture sequence.

[tdresser, 2014/02/13 18:14:09]

This isn't currently used, but will likely be in the future. Should I strip it
out for now?

[jdduke (slow), 2014/02/13 19:40:00]

Hmm, I suppose it doesn't hurt if for no other reason than consistency.

+    TOUCH_BEGIN,           // A touch down occured during a gesture sequence.
+    TOUCH_MOVE,            // A touch move occured during a gesture sequence.
+    TOUCH_END,             // A touch up occured during a gesture sequence.
+    TOUCH_TIMEOUT,         // Timeout from an existing gesture sequence.
   };
 
   GestureEventPacket();