Add SkColorSpace to GrDrawContext

tests/DFPathRendererTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 48 matching lines @@
 }
 
 DEF_GPUTEST_FOR_ALL_GL_CONTEXTS(AADistanceFieldPathRenderer, reporter, ctxInfo) {
     // The DF PR only works with contexts that support derivatives
     if (!ctxInfo.grContext()->caps()->shaderCaps()->shaderDerivativeSupport()) {
         return;
     }
     sk_sp<GrDrawContext> drawContext(ctxInfo.grContext()->newDrawContext(SkBackingFit::kApprox,
                                                                          800, 800,
                                                                          kSkia8888_GrPixelConfig,
+                                                                         nullptr,
                                                                          0,
                                                                          kTopLeft_GrSurfaceOrigin));
     if (!drawContext) {
         return;
     }
 
     GrAADistanceFieldPathRenderer dfpr;
     GrTestTarget tt;
     ctxInfo.grContext()->getTestTarget(&tt, drawContext);
     GrResourceProvider* rp = tt.resourceProvider();
 
     test_far_from_origin(drawContext.get(), &dfpr, rp);
     ctxInfo.grContext()->flush();
 }
 #endif