[Android] Reland "Provide unhandled tap event notifications"

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index a291f9746124f8c0862403690b5bb48417a9738e..6bd95f174ba51ef8f536789dcb76d348bd42f3ff 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -599,6 +599,12 @@ void ContentViewCoreImpl::OnGestureEventAck(const blink::WebGestureEvent& event,
     case WebInputEvent::GesturePinchEnd:
       Java_ContentViewCore_onPinchEndEventAck(env, j_obj.obj());
       break;
+    case WebInputEvent::GestureTap:
+      if (ack_result != INPUT_EVENT_ACK_STATE_CONSUMED) {
+        Java_ContentViewCore_onTapEventNotConsumed(
+            env, j_obj.obj(), event.x * dpi_scale(), event.y * dpi_scale());
+      }
+      break;
     case WebInputEvent::GestureDoubleTap:
       Java_ContentViewCore_onDoubleTapEventAck(env, j_obj.obj());
       break;