[DevTools] Interactive test for DevTools touch emulation.

content/browser/renderer_host/input/touch_emulator.cc

Index: content/browser/renderer_host/input/touch_emulator.cc
diff --git a/content/browser/renderer_host/input/touch_emulator.cc b/content/browser/renderer_host/input/touch_emulator.cc
index bee97fb0772e38460e74df1bed6d03f01fc612c5..9068dd1e55112f78816d35f159da5be54ce1f80b 100644
--- a/content/browser/renderer_host/input/touch_emulator.cc
+++ b/content/browser/renderer_host/input/touch_emulator.cc
@@ -131,7 +131,8 @@ bool TouchEmulator::HandleMouseEvent(const WebMouseEvent& mouse_event) {
   if (mouse_event.button != WebMouseEvent::ButtonLeft)
     return true;
 
-  if (mouse_event.type == WebInputEvent::MouseMove) {
+  if (mouse_event.type == WebInputEvent::MouseMove &&
+      mouse_event.timeStampSeconds) {
     if (last_mouse_event_was_move_ &&
         mouse_event.timeStampSeconds < last_mouse_move_timestamp_ +
             kMouseMoveDropIntervalSeconds)
@@ -316,7 +317,7 @@ void TouchEmulator::PinchEnd(const WebGestureEvent& event) {
   client_->ForwardGestureEvent(pinch_event_);
 }
 
-void TouchEmulator::FillPinchEvent(const WebInputEvent& event) {
+void TouchEmulator::FillPinchEvent(const WebGestureEvent& event) {
   pinch_event_.timeStampSeconds = event.timeStampSeconds;
   pinch_event_.modifiers = event.modifiers;
   pinch_event_.sourceDevice = blink::WebGestureEvent::Touchscreen;
@@ -362,6 +363,12 @@ bool TouchEmulator::FillTouchEventAndPoint(const WebMouseEvent& mouse_event) {
   WebTouchEventTraits::ResetTypeAndTouchStates(
       eventType, mouse_event.timeStampSeconds, &touch_event_);
 
+  if (!touch_event_.timeStampSeconds) {
+    // Gesture detector does not tolerate null timestamps generated in tests.
+    touch_event_.timeStampSeconds =
+        (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
+  }
+
   WebTouchPoint& point = touch_event_.touches[0];
   point.id = 0;
   point.radiusX = point.radiusY = 1.f;