Fix mouse wheel events in pointer lock on aura.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index c81379835e52682f803a3a864406fa751b442682..2161e13c683a876a575ae18afe938eebd830189f 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -2331,6 +2331,14 @@ void RenderWidgetHostViewAura::OnMouseEvent(ui::MouseEvent* event) {
         aura::client::GetCursorClient(window_->GetRootWindow());
     DCHECK(!cursor_client || !cursor_client->IsCursorVisible());
 
+    if (event->type() == ui::ET_MOUSEWHEEL) {

[ananta, 2013/06/05 23:16:14]

We should be handling this similarly for mouse wheel events received when the
mouse is not locked?

[scheib, 2013/06/06 02:42:37]

True. That code already exists below, outside of the if(mouse_locked_) block. It
is more complicated as it deals with not having focus on Windows. While in mouse
like we will always have focus (loss of focus drops mouse lock).

+      WebKit::WebMouseWheelEvent mouse_wheel_event =
+          MakeWebMouseWheelEvent(static_cast<ui::MouseWheelEvent*>(event));
+      if (mouse_wheel_event.deltaX != 0 || mouse_wheel_event.deltaY != 0)
+        host_->ForwardWheelEvent(mouse_wheel_event);
+      return;
+    }
+
     WebKit::WebMouseEvent mouse_event = MakeWebMouseEvent(event);
     gfx::Point center(gfx::Rect(window_->bounds().size()).CenterPoint());