Rename and clarify semantics of GrContext::resolveRenderTarget.

include/gpu/GrSurface.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrSurface_DEFINED
 #define GrSurface_DEFINED
@@ skipping 98 matching lines @@
                      GrPixelConfig config,
                      const void* buffer,
                      size_t rowBytes = 0,
                      uint32_t pixelOpsFlags = 0);
 
     /**
      * After this returns any pending writes to the surface will be issued to the backend 3D API.
      */
     void flushWrites();
 
+
+    /**
+     * After this returns any pending writes to the surface will be issued to the backend 3D API and
+     * if the surface has MSAA it will be resolved.
+     */
+    void prepareForExternalRead();
+    
     /** Access methods that are only to be used within Skia code. */
     inline GrSurfacePriv surfacePriv();
     inline const GrSurfacePriv surfacePriv() const;
 
 protected:
     // Methods made available via GrSurfacePriv
     SkImageInfo info() const;
     bool savePixels(const char* filename);
     bool hasPendingRead() const;
     bool hasPendingWrite() const;
     bool hasPendingIO() const;
     bool isSameAs(const GrSurface* other) const;
 
     // Provides access to methods that should be public within Skia code.
     friend class GrSurfacePriv;
 
     GrSurface(GrGpu* gpu, bool isWrapped, const GrSurfaceDesc& desc)
     : INHERITED(gpu, isWrapped)
     , fDesc(desc) {
     }
 
     GrSurfaceDesc fDesc;
 
 private:
     typedef GrGpuResource INHERITED;
 };
 
 #endif