globalCompositeOperation is ignored in stroke, strokeRect.

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1357 matching lines @@
 
 void GraphicsContext::strokePath(const Path& pathToStroke)
 {
     if (paintingDisabled() || pathToStroke.isEmpty())
         return;
 
     const SkPath& path = pathToStroke.skPath();
     drawPath(path, immutableState()->strokePaint());
 }
 
+void GraphicsContext::strokeRect(const FloatRect& rect)
+{
+    strokeRect(rect, strokeThickness());
+}
+
 void GraphicsContext::strokeRect(const FloatRect& rect, float lineWidth)
 {
     if (paintingDisabled())
         return;
 
     SkPaint paint(immutableState()->strokePaint());
     paint.setStrokeWidth(WebCoreFloatToSkScalar(lineWidth));
     // Reset the dash effect to account for the width
     immutableState()->strokeData().setupPaintDashPathEffect(&paint, 0);
     // strokerect has special rules for CSS when the rect is degenerate:
@@ skipping 520 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "PlatformContextSkia::trackTextRegion");
         m_textRegion.join(textRect);
     }
 }
 
 }