Render opaque border with no shadow for web contents modal dialogs under Views/Win32

ui/views/bubble/bubble_border.cc

Index: ui/views/bubble/bubble_border.cc
diff --git a/ui/views/bubble/bubble_border.cc b/ui/views/bubble/bubble_border.cc
index 1b6ceed7c5e1a55c3cba8e08f48e835f5da9d1a7..37a8eb1546696758592c88b8b332e3db8c4318da 100644
--- a/ui/views/bubble/bubble_border.cc
+++ b/ui/views/bubble/bubble_border.cc
@@ -112,6 +112,7 @@ BorderImages* GetBorderImages(BubbleBorder::Shadow shadow) {
       set = new BorderImages(kShadowImages, kShadowArrows, 0, 0, 3);
       break;
     case BubbleBorder::NO_SHADOW:
+    case BubbleBorder::NO_SHADOW_OPAQUE_BORDER:
       set = new BorderImages(kNoShadowImages, kNoShadowArrows, 6, 7, 4);
       break;
     case BubbleBorder::BIG_SHADOW:
@@ -332,6 +333,9 @@ void BubbleBorder::DrawArrow(gfx::Canvas* canvas,
 }
 
 void BubbleBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
+  if (border_->shadow() == BubbleBorder::NO_SHADOW_OPAQUE_BORDER)
+    canvas->DrawColor(border_->background_color());
+
   // Clip out the client bounds to prevent overlapping transparent widgets.
   if (!border_->client_bounds().IsEmpty()) {
     SkRect client_rect(gfx::RectToSkRect(border_->client_bounds()));