Add RTL support for focus rings

We do not currently flip the canvas for focus rings when RTL is enabled.
This can cause certain focus rings to be drawn incorrectly for
their corresponding buttons.

Bug: 960284
Change-Id: I1144cee667c626e4978aaff9bd3cd8901494dbb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696443Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677044}

ui/views/controls/focus_ring.cc

@@ -30,6 +30,7 @@ std::unique_ptr<FocusRing> FocusRing::Install(View* parent) {
   auto ring = base::WrapUnique<FocusRing>(new FocusRing());
   ring->set_owned_by_client();
   parent->AddChildView(ring.get());
+  ring->EnableCanvasFlippingForRTLUI(parent->flip_canvas_on_paint_for_rtl_ui());
   ring->InvalidateLayout();
   ring->SchedulePaint();
   return ring;
@@ -101,6 +102,8 @@ void FocusRing::OnPaint(gfx::Canvas* canvas) {
     path = GetHighlightPath(parent());
 
   DCHECK(IsPathUseable(path));
+  DCHECK_EQ(flip_canvas_on_paint_for_rtl_ui(),
+            parent()->flip_canvas_on_paint_for_rtl_ui());
   SkRect bounds;
   SkRRect rbounds;
   if (path.isRect(&bounds)) {