Make touch-action apply to double-tap zoom

content/browser/renderer_host/input/touch_action_filter.cc

Index: content/browser/renderer_host/input/touch_action_filter.cc
diff --git a/content/browser/renderer_host/input/touch_action_filter.cc b/content/browser/renderer_host/input/touch_action_filter.cc
index 14e84229faf57abec6ef384a58fad69c162fef1e..75253060ea00e101bc61152f489770c8f5c26144 100644
--- a/content/browser/renderer_host/input/touch_action_filter.cc
+++ b/content/browser/renderer_host/input/touch_action_filter.cc
@@ -17,6 +17,7 @@ namespace content {
 TouchActionFilter::TouchActionFilter() :
   drop_scroll_gesture_events_(false),
   drop_pinch_gesture_events_(false),
+  drop_current_tap_ending_event_(false),
   allowed_touch_action_(TOUCH_ACTION_AUTO) {
 }
 
@@ -80,6 +81,37 @@ bool TouchActionFilter::FilterGestureEvent(WebGestureEvent* gesture_event) {
       DCHECK(!drop_scroll_gesture_events_);
       break;
 
+    // If double tap is disabled, there's no reason for the tap delay.
+    case WebInputEvent::GestureTapUnconfirmed:
+      if (allowed_touch_action_ != TOUCH_ACTION_AUTO) {
+        gesture_event->type = WebInputEvent::GestureTap;
+        drop_current_tap_ending_event_ = true;
+      }
+      break;
+
+    case WebInputEvent::GestureTap:
+      if (drop_current_tap_ending_event_) {
+        drop_current_tap_ending_event_ = false;
+        return true;
+      }
+      break;
+
+    case WebInputEvent::GestureTapCancel:

[Rick Byers, 2014/02/18 20:40:16]

maybe combine this case with the above into a single case since they logically
represent the same scenario?

[tdresser, 2014/02/18 21:27:15]

Done.

+      if (drop_current_tap_ending_event_) {
+        drop_current_tap_ending_event_ = false;
+        return true;
+      }
+      break;
+
+    case WebInputEvent::GestureTapDown:
+      DCHECK(!drop_current_tap_ending_event_);
+      break;
+
+    case WebInputEvent::GestureDoubleTap:
+      if (allowed_touch_action_ != TOUCH_ACTION_AUTO)
+        return true;
+      break;
+
     default:
       // Gesture events unrelated to touch actions (panning/zooming) are left
       // alone.