Add isUnifiedMultisampled entry point to GrDrawContext

src/gpu/SkGpuDevice_drawTexture.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "GrBlurUtils.h"
@@ skipping 168 matching lines @@
     // same happens for any mask filter that extends the bounds rendered in the dst.
     // This is conservative as a mask filter does not have to expand the bounds rendered.
     bool coordsAllInsideSrcRect = !paint.isAntiAlias() && !mf;
 
     // Check for optimization to drop the src rect constraint when on bilerp.
     if (filterMode && GrTextureParams::kBilerp_FilterMode == *filterMode &&
         GrTextureAdjuster::kYes_FilterConstraint == constraintMode && coordsAllInsideSrcRect) {
         SkMatrix combinedMatrix;
         combinedMatrix.setConcat(viewMatrix, srcToDstMatrix);
         if (can_ignore_bilerp_constraint(*producer, clippedSrcRect, combinedMatrix,
-                                         fRenderTarget->isUnifiedMultisampled())) {
+                                         fDrawContext->isUnifiedMultisampled())) {
             constraintMode = GrTextureAdjuster::kNo_FilterConstraint;
         }
     }
 
     const SkMatrix* textureMatrix;
     SkMatrix tempMatrix;
     if (canUseTextureCoordsAsLocalCoords) {
         textureMatrix = &SkMatrix::I();
     } else {
         if (!srcToDstMatrix.invert(&tempMatrix)) {
@@ skipping 36 matching lines @@
                                       rrect)) {
         return;
     }
     SkPath rectPath;
     rectPath.addRect(clippedDstRect);
     rectPath.setIsVolatile(true);
     GrBlurUtils::drawPathWithMaskFilter(this->context(), fDrawContext.get(), fClip,
                                         rectPath, &grPaint, viewMatrix, mf, GrStyle::SimpleFill(),
                                         true);
 }