Wheel scroll latching enabled behind flag.

content/browser/renderer_host/input/mouse_wheel_event_queue.cc

Index: content/browser/renderer_host/input/mouse_wheel_event_queue.cc
diff --git a/content/browser/renderer_host/input/mouse_wheel_event_queue.cc b/content/browser/renderer_host/input/mouse_wheel_event_queue.cc
index d1d3bc22276279290e8cde1271e27591b76b26e3..432c28d496866eba10c348b7f52afe8e456be734 100644
--- a/content/browser/renderer_host/input/mouse_wheel_event_queue.cc
+++ b/content/browser/renderer_host/input/mouse_wheel_event_queue.cc
@@ -34,13 +34,16 @@ class QueuedWebMouseWheelEvent : public MouseWheelEventWithLatencyInfo {
 };
 
 MouseWheelEventQueue::MouseWheelEventQueue(MouseWheelEventQueueClient* client,
-                                           int64_t scroll_transaction_ms)
+                                           bool touchpad_wheel_scroll_latching)
     : client_(client),
       needs_scroll_begin_(true),
       needs_scroll_end_(false),
-      scroll_transaction_ms_(scroll_transaction_ms),
+      touchpad_wheel_scroll_latching_(touchpad_wheel_scroll_latching),

[tdresser, 2016/07/25 20:37:29]

Sorry for the multiple rename requests...

Since this logic is in the MouseWheelEventQueue, it would be reasonable to just
call this enable_scroll_latching, or something like that.

[sahel, 2016/07/25 21:28:35]

Done.

       scrolling_device_(blink::WebGestureDeviceUninitialized) {
   DCHECK(client);
+  scroll_transaction_ms_ = touchpad_wheel_scroll_latching_
+                               ? kDefaultWheelScrollLatchingTransactionMs
+                               : 0;
 }
 
 MouseWheelEventQueue::~MouseWheelEventQueue() {