Add smoothness test for hover during trackpad scrolling [perf implications]

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index 366d0a8b68aa219db1eab3446ce393848b4eefc8..f491519b81ebe1472efc2bd62af4ce6c77cf8c1f 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -289,6 +289,19 @@ bool BeginSmoothScroll(v8::Isolate* isolate,
   if (!context.Init(false))
     return false;
 
+  if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT) {
+    // Ensure the mouse is centered and visible, in case it will
+    // trigger any hover or mousemove effects.
+    blink::WebRect contentRect =
+        context.web_view()->mainFrame()->visibleContentRect();
+    blink::WebMouseEvent mouseMove;
+    mouseMove.type = blink::WebInputEvent::MouseMove;
+    mouseMove.x = (contentRect.width - contentRect.x) / 2;
+    mouseMove.y = (contentRect.height - contentRect.y) / 2;

[Ken Russell (switch to Gerrit), 2015/05/26 22:58:32]

Sorry if this is a stupid question, but did you mean these to be:

  mouseMove.x = contentRect.x + contentRect.width / 2;
  mouseMove.y = contentRect.y + contentRect.height / 2;

?

[tdresser, 2015/05/27 14:14:16]

Uh... Yeah...
Not a stupid question.
Just a stupid mistake...

Done.

+    context.web_view()->handleInputEvent(mouseMove);
+    context.web_view()->setCursorVisibilityState(true);
+  }
+
   scoped_refptr<CallbackAndContext> callback_and_context =
       new CallbackAndContext(
           isolate, callback, context.web_frame()->mainWorldScriptContext());