[md] Give each infobar its own layer.

chrome/browser/ui/views/infobars/infobar_container_view.cc

Index: chrome/browser/ui/views/infobars/infobar_container_view.cc
diff --git a/chrome/browser/ui/views/infobars/infobar_container_view.cc b/chrome/browser/ui/views/infobars/infobar_container_view.cc
index b50662f55c9ddab6131b7bd2be25e79674bc7329..d2f1fab0d7df556be99a9f4b86078b168a3a4756 100644
--- a/chrome/browser/ui/views/infobars/infobar_container_view.cc
+++ b/chrome/browser/ui/views/infobars/infobar_container_view.cc
@@ -18,8 +18,6 @@ InfoBarContainerView::InfoBarContainerView(Delegate* delegate)
     : infobars::InfoBarContainer(delegate) {
   set_id(VIEW_ID_INFO_BAR_CONTAINER);
   SetEventTargeter(make_scoped_ptr(new views::ViewTargeter(this)));
-  SetPaintToLayer(true);
-  SetFillsBoundsOpaquely(false);
 }
 
 InfoBarContainerView::~InfoBarContainerView() {
@@ -71,7 +69,8 @@ void InfoBarContainerView::PlatformSpecificRemoveInfoBar(
 bool InfoBarContainerView::DoesIntersectRect(const View* target,
                                              const gfx::Rect& rect) const {
   DCHECK_EQ(this, target);
-  // Don't handle events on the vertical overlap portion of the view (the
-  // vertical space occupied by the arrow).
-  return rect.bottom() >= GetVerticalOverlap(nullptr);
+  // Only events that intersect the portion below the arrow are interesting.
+  gfx::Rect non_arrow_bounds = GetLocalBounds();
+  non_arrow_bounds.Inset(0, GetVerticalOverlap(nullptr), 0, 0);
+  return rect.Intersects(non_arrow_bounds);
 }