More framework support for TransferBuffers

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 154 matching lines @@
                       int width, int height,
                       GrPixelConfig,
                       void* buffer,
                       size_t rowBytes) override;
 
     bool onWritePixels(GrSurface*,
                        int left, int top, int width, int height,
                        GrPixelConfig config, const void* buffer,
                        size_t rowBytes) override;
 
+    bool onTransferPixels(GrSurface*,
+                          int left, int top, int width, int height,
+                          GrPixelConfig config, GrTransferBuffer* buffer,
+                          size_t offset, size_t rowBytes) override;
+
     void onResolveRenderTarget(GrRenderTarget* target) override;
 
     void onDraw(const DrawArgs&, const GrNonInstancedVertices&) override;
 
     bool onCopySurface(GrSurface* dst,
                        GrSurface* src,
                        const SkIRect& srcRect,
                        const SkIPoint& dstPoint) override;
 
     // binds texture unit in GL
@@ skipping 356 matching lines @@
 
     // Mapping of pixel configs to known supported stencil formats to be used
     // when adding a stencil buffer to a framebuffer.
     int fPixelConfigToStencilIndex[kGrPixelConfigCnt];
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif