Adopt "QuickScale" double-tap drag zoom code in the GestureProvider

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 fe0926139c84528e2a060eae7ff974cb30d74143..f4c0c8e6a2e118f4c835d42c773dd690deeaa402 100644
--- a/content/browser/renderer_host/input/gesture_event_queue.cc
+++ b/content/browser/renderer_host/input/gesture_event_queue.cc
@@ -285,7 +285,7 @@ void GestureEventQueue::MergeOrInsertScrollAndPinchEvent(
   }
   GestureEventWithLatencyInfo* last_event = &coalesced_gesture_events_.back();
   if (last_event->CanCoalesceWith(gesture_event)) {
-      last_event->CoalesceWith(gesture_event);
+    last_event->CoalesceWith(gesture_event);
     if (!combined_scroll_pinch_.IsIdentity()) {
       combined_scroll_pinch_.ConcatTransform(
           GetTransformForEvent(gesture_event));