Harmony - fix border for OIB.

ui/views/bubble/bubble_border.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/bubble/bubble_border.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkDrawLooper.h"
@@ skipping 489 matching lines @@
 
   // Fill the contents with a round-rect region to match the border images.
   SkPaint paint;
   paint.setAntiAlias(true);
   paint.setStyle(SkPaint::kFill_Style);
   paint.setColor(border_->background_color());
   SkPath path;
   gfx::RectF bounds(view->GetLocalBounds());
   bounds.Inset(gfx::InsetsF(border_->GetInsets()));
   if (UseMd()) {
-    // The border is 1px at all scale factors. Leave room for it.
+    // The border is 1px at all scale factors. Leave room for it. It's partially
+    // transparent, so we don't want to draw any background underneath it.
     const SkScalar one_pixel = SkFloatToScalar(1 / canvas->image_scale());
     bounds.Inset(gfx::InsetsF(one_pixel));
   }
 
   canvas->DrawRoundRect(bounds, border_->GetBorderCornerRadius(), paint);
 }
 
 }  // namespace views