Split drawing functionality out of GrContext and into new GrDrawContext

src/effects/SkXfermodeImageFilter.cpp

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermodeImageFilter.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkXfermode.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
+#include "GrDrawContext.h"
 #include "effects/GrTextureDomain.h"
 #include "SkGr.h"
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkXfermodeImageFilter::SkXfermodeImageFilter(SkXfermode* mode,
                                              SkImageFilter* inputs[2],
                                              const CropRect* cropRect)
   : INHERITED(2, inputs, cropRect), fMode(mode) {
@@ skipping 144 matching lines @@
     GrPaint paint;
     SkAutoTUnref<GrFragmentProcessor> foregroundDomain(GrTextureDomainEffect::Create(
         foregroundTex, foregroundMatrix,
         GrTextureDomain::MakeTexelDomain(foregroundTex, foreground.bounds()),
         GrTextureDomain::kDecal_Mode,
         GrTextureParams::kNone_FilterMode)
     );
 
     paint.addColorProcessor(foregroundDomain.get());
     paint.addColorProcessor(xferProcessor)->unref();
-    context->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, SkMatrix::I(), srcRect);
+
+    GrDrawContext* drawContext = context->drawContext();
+    if (!drawContext) {
+        return false;
+    }
+
+    drawContext->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, 
+                          SkMatrix::I(), srcRect);
 
     offset->fX = backgroundOffset.fX;
     offset->fY = backgroundOffset.fY;
     WrapTexture(dst, src.width(), src.height(), result);
     return true;
 }
 
 #endif