gpu benchmarking swipe for touchpad

content/browser/renderer_host/input/synthetic_gesture_target_base.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_base.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
index 65667d802e9c5b95d49c9b08054c0563bd49f3d0..b53742920d21d68e629cde9fa8734d4650e984e3 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
@@ -18,6 +18,7 @@ using blink::WebTouchEvent;
 using blink::WebTouchPoint;
 using blink::WebMouseEvent;
 using blink::WebMouseWheelEvent;
+using blink::WebGestureEvent;
 
 namespace content {
 namespace {
@@ -75,6 +76,12 @@ void SyntheticGestureTargetBase::DispatchInputEventToPlatform(
           PointIsWithinContents(web_mouse.x, web_mouse.y))
         << "Mouse pointer is not within content bounds on MouseDown.";
     DispatchWebMouseEventToPlatform(web_mouse, latency_info);
+  } else if (event.type() == WebInputEvent::GestureFlingStart) {
+    const WebGestureEvent& gesture_event =
+        static_cast<const WebGestureEvent&>(event);
+    CHECK(gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad)
+        << "The gesture event source must be touchpad.";
+    DispatchTouchpadGestureFlingStartToPlatform(gesture_event, latency_info);
   } else {
     NOTREACHED();
   }
@@ -101,6 +108,14 @@ void SyntheticGestureTargetBase::DispatchWebMouseEventToPlatform(
   host_->ForwardMouseEventWithLatencyInfo(web_mouse, latency_info);
 }
 
+void SyntheticGestureTargetBase::DispatchTouchpadGestureFlingStartToPlatform(
+    const blink::WebGestureEvent& web_gesture,
+    const ui::LatencyInfo& latency_info) {
+  DCHECK_EQ(web_gesture.type(), WebInputEvent::GestureFlingStart);
+  DCHECK_EQ(web_gesture.sourceDevice, blink::WebGestureDeviceTouchpad);
+  host_->ForwardGestureEventWithLatencyInfo(web_gesture, latency_info);

[bokan, 2017/03/10 14:41:57]

This base implementation is meant to work on Mac? Doesn't Mac's event stream for
flings differ significantly enough that this won't work?

[sahel, 2017/03/10 21:51:41]

Swipe for touchpad sends a bunch of mouse wheel events followed by a fling
event. The only platform that has this event sequence is ChromeOS.
In aura implementation I generate a ui event from the fling gesture event.
But in the base implementation I just forward the GFS event itself.

Does it work on mac or not? yes it does, but it doesn't simulate the event
sequence on mac and it's not intended to do so. This is used for testing
parts of the code that handle touchpad fling.

+}
+
 void SyntheticGestureTargetBase::SetNeedsFlush() {
   host_->SetNeedsFlush();
 }