Fixed a bug in TouchActionFilter for unidirectional touch-actions.

content/browser/renderer_host/input/input_router_impl_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/input/input_router_impl.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 214 matching lines @@
     input_router_->SendMouseEvent(MouseEventWithLatencyInfo(
         SyntheticWebMouseEventBuilder::Build(type, x, y, 0)));
   }
 
   void SimulateWheelEventWithPhase(WebMouseWheelEvent::Phase phase) {
     input_router_->SendWheelEvent(MouseWheelEventWithLatencyInfo(
         SyntheticWebMouseWheelEventBuilder::Build(phase)));
   }
 
   void SimulateGestureEvent(WebGestureEvent gesture) {
-    // Ensure non-zero touchscreen fling velocities, as the router will
-    // validate aganst such.
-    if (gesture.type() == WebInputEvent::GestureFlingStart &&
+    if (gesture.type() == WebInputEvent::GestureScrollBegin &&
         gesture.sourceDevice == blink::WebGestureDeviceTouchscreen &&
-        !gesture.data.flingStart.velocityX &&
-        !gesture.data.flingStart.velocityY) {
+        !gesture.data.scrollBegin.deltaXHint &&
+        !gesture.data.scrollBegin.deltaYHint) {
+      // Ensure non-zero scroll-begin offset-hint to make the event sane,
+      // prevents unexpected filtering at TouchActionFilter.
+      gesture.data.scrollBegin.deltaYHint = 2.f;
+    } else if (gesture.type() == WebInputEvent::GestureFlingStart &&
+               gesture.sourceDevice == blink::WebGestureDeviceTouchscreen &&
+               !gesture.data.flingStart.velocityX &&
+               !gesture.data.flingStart.velocityY) {
+      // Ensure non-zero touchscreen fling velocities, as the router will
+      // validate against such.
       gesture.data.flingStart.velocityX = 5.f;
     }
 
     input_router_->SendGestureEvent(GestureEventWithLatencyInfo(gesture));
   }
 
   void SimulateGestureEvent(WebInputEvent::Type type,
                             WebGestureDevice source_device) {
     SimulateGestureEvent(
         SyntheticWebGestureEventBuilder::Build(type, source_device));
@@ skipping 2187 matching lines @@
   EXPECT_EQ(80, sent_event->data.flingStart.velocityY);
 
   const WebGestureEvent* filter_event =
       GetFilterWebInputEvent<WebGestureEvent>();
   TestLocationInFilterEvent(filter_event, orig);
   EXPECT_EQ(30, filter_event->data.flingStart.velocityX);
   EXPECT_EQ(40, filter_event->data.flingStart.velocityY);
 }
 
 }  // namespace content