Add SkColorSpace to GrDrawContext

src/effects/SkAlphaThresholdFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAlphaThresholdFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 86 matching lines @@
                                                                const SkIRect& bounds) const {
     GrPixelConfig config;
     if (context->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
         config = kAlpha_8_GrPixelConfig;
     } else {
         config = kRGBA_8888_GrPixelConfig;
     }
 
     sk_sp<GrDrawContext> drawContext(context->newDrawContext(SkBackingFit::kApprox,
                                                              bounds.width(), bounds.height(),
-                                                             config));
+                                                             config, nullptr));
     if (!drawContext) {
         return nullptr;
     }
 
     GrPaint grPaint;
     grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
     SkRegion::Iterator iter(fRegion);
     drawContext->clear(nullptr, 0x0, true);
 
     GrFixedClip clip(SkIRect::MakeWH(bounds.width(), bounds.height()));
@@ skipping 141 matching lines @@
                                           dst);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkAlphaThresholdFilterImpl::toString(SkString* str) const {
     str->appendf("SkAlphaThresholdImageFilter: (");
     str->appendf("inner: %f outer: %f", fInnerThreshold, fOuterThreshold);
     str->append(")");
 }
 #endif