[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 f32a9ef4432906966bf69d56a2f3f7a15285f980..66f1a50d7b145800531c00c9db562c2253c51131 100644
--- a/content/browser/renderer_host/input/touch_emulator.cc
+++ b/content/browser/renderer_host/input/touch_emulator.cc
@@ -331,6 +331,11 @@ bool TouchEmulator::FillTouchEventAndPoint(const WebMouseEvent& mouse_event) {
 
   touch_event_.touchesLength = 1;
   touch_event_.timeStampSeconds = mouse_event.timeStampSeconds;
+  if (!touch_event_.timeStampSeconds) {

[jdduke (slow), 2014/04/23 16:35:53]

Why not have the tests fill the timeStampSeconds? I'd rather do that and DCHECK
here.

[dgozman, 2014/04/23 17:27:20]

I would like that too, but interactive test issues platform events in many
different places (at least one per platform/configuration), and I doubt that I
can fix them all.

+    // Gesture detector does not tolerate null timestamps generated in tests.
+    touch_event_.timeStampSeconds =
+        (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
+  }
   touch_event_.modifiers = mouse_event.modifiers;
 
   WebTouchPoint& point = touch_event_.touches[0];