Add Gr*Proxy classes

src/gpu/GrRenderTarget.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrRenderTarget.h"
 
@@ skipping 91 matching lines @@
         SkSafeSetNull(fRenderTarget->fStencilAttachment);
         return false;
     }
     return true;
 }
 
 const GrGpu::MultisampleSpecs&
 GrRenderTargetPriv::getMultisampleSpecs(const GrStencilSettings& stencil) const {
     return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil);
 }
+
+GrRenderTarget::SampleConfig GrRenderTarget::ComputeSampleConfig(const GrCaps& caps,
+                                                                 int sampleCnt) {
+    return (caps.usesMixedSamples() && sampleCnt > 0)
+                        ? GrRenderTarget::kStencil_SampleConfig
+                        : GrRenderTarget::kUnified_SampleConfig;
+}
+