Split drawing functionality out of GrContext and into new GrDrawContext

src/effects/SkDisplacementMapEffect.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 "SkDisplacementMapEffect.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkUnPreMultiply.h"
 #include "SkColorPriv.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
+#include "GrDrawContext.h"
 #include "GrCoordTransform.h"
 #include "GrInvariantOutput.h"
 #include "effects/GrTextureDomain.h"
 #include "gl/GrGLProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 #endif
 
 namespace {
 
 #define kChannelSelectorKeyBits 3; // Max value is 4, so 3 bits are required at most
@@ skipping 425 matching lines @@
                                         scale,
                                         displacement,
                                         offsetMatrix,
                                         color,
                                         colorBM.dimensions()))->unref();
     SkIRect colorBounds = bounds;
     colorBounds.offset(-colorOffset);
     SkMatrix matrix;
     matrix.setTranslate(-SkIntToScalar(colorBounds.x()),
                         -SkIntToScalar(colorBounds.y()));
-    context->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, matrix,
-                      SkRect::Make(colorBounds));
+
+    GrDrawContext* drawContext = context->drawContext();
+    if (!drawContext) {
+        return false;
+    }
+
+    drawContext->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, matrix,
+                          SkRect::Make(colorBounds));
     offset->fX = bounds.left();
     offset->fY = bounds.top();
     WrapTexture(dst, bounds.width(), bounds.height(), result);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrDisplacementMapEffect::GrDisplacementMapEffect(
                              SkDisplacementMapEffect::ChannelSelectorType xChannelSelector,
@@ skipping 165 matching lines @@
                                        const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
     const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>();
 
     uint32_t xKey = displacementMap.xChannelSelector();
     uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     b->add32(xKey | yKey);
 }
 #endif