Touch Action could cause wheel gestures to be filtered.

content/browser/renderer_host/input/render_widget_host_latency_tracker_unittest.cc

 // Copyright 2014 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 "base/test/histogram_tester.h"
 #include "content/browser/renderer_host/input/render_widget_host_latency_tracker.h"
 #include "content/common/input/synthetic_web_input_event_builders.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 152 matching lines @@
         "Event.Latency.ScrollUpdate.RendererSwapToBrowserNotified", 1));
     EXPECT_TRUE(HistogramSizeEq(
         "Event.Latency.ScrollUpdate.BrowserNotifiedToBeforeGpuSwap", 1));
     EXPECT_TRUE(HistogramSizeEq("Event.Latency.ScrollUpdate.GpuSwap", 1));
   }
 }
 
 TEST_F(RenderWidgetHostLatencyTrackerTest,
        LatencyTerminatedOnAckIfRenderingNotScheduled) {
   {
-    auto scroll = SyntheticWebGestureEventBuilder::BuildScrollBegin(5.f, -5.f);
+    auto scroll = SyntheticWebGestureEventBuilder::BuildScrollBegin(
+        5.f, -5.f, blink::WebGestureDeviceTouchscreen);
     ui::LatencyInfo scroll_latency;
     AddFakeComponents(*tracker(), &scroll_latency);
     // Don't include the rendering schedule component, since we're testing the
     // case where rendering isn't scheduled.
     tracker()->OnInputEvent(scroll, &scroll_latency);
     tracker()->OnInputEventAck(scroll, &scroll_latency);
     EXPECT_TRUE(scroll_latency.FindLatency(
         ui::INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT, 0, nullptr));
     EXPECT_TRUE(scroll_latency.terminated());
   }
@@ skipping 122 matching lines @@
   {
     NativeWebKeyboardEvent event;
     event.type = blink::WebKeyboardEvent::KeyDown;
     ui::LatencyInfo latency_info;
     tracker()->OnInputEvent(event, &latency_info);
     EXPECT_EQ(0u, latency_info.input_coordinates_size());
   }
 }
 
 TEST_F(RenderWidgetHostLatencyTrackerTest, ScrollLatency) {
-  auto scroll_begin = SyntheticWebGestureEventBuilder::BuildScrollBegin(5, -5);
+  auto scroll_begin = SyntheticWebGestureEventBuilder::BuildScrollBegin(
+      5, -5, blink::WebGestureDeviceTouchscreen);
   ui::LatencyInfo scroll_latency;
   scroll_latency.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 0,
                                   0);
   tracker()->OnInputEvent(scroll_begin, &scroll_latency);
   EXPECT_TRUE(
       scroll_latency.FindLatency(ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                                  tracker()->latency_component_id(), nullptr));
   EXPECT_EQ(2U, scroll_latency.latency_components().size());
 
   // The first GestureScrollUpdate should be provided with
@@ skipping 29 matching lines @@
   EXPECT_FALSE(scroll_latency.FindLatency(
       ui::INPUT_EVENT_LATENCY_FIRST_SCROLL_UPDATE_ORIGINAL_COMPONENT,
       tracker()->latency_component_id(), nullptr));
   EXPECT_TRUE(scroll_latency.FindLatency(
       ui::INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
       tracker()->latency_component_id(), nullptr));
   EXPECT_EQ(3U, scroll_latency.latency_components().size());
 }
 
 }  // namespace content