Add wrapBackendTextureAsRenderTarget API

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 137 matching lines @@
                                const void* srcData, size_t rowBytes) override;
     GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                          GrGpuResource::LifeCycle lifeCycle,
                                          const void* srcData) override;
     GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) override;
     GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) override;
     GrTransferBuffer* onCreateTransferBuffer(size_t size, TransferType type) override;
     GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership) override;
     GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                               GrWrapOwnership) override;
+    GrRenderTarget* onWrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&,
+                                                       GrWrapOwnership) override;
     // Given a GrPixelConfig return the index into the stencil format array on GrGLCaps to a
     // compatible stencil format, or negative if there is no compatible stencil format.
     int getCompatibleStencilIndex(GrPixelConfig config);
 
     // If |desc.fTextureStorageAllocator| exists, use that to create the
     // texture. Otherwise, create the texture directly.
     // Returns whether the texture is successfully created. On success, the
     // result is stored in |info|.
     // The texture is populated with |srcData|, if it exists.
     // The texture parameters are cached in |initialTexParams|.
@@ skipping 436 matching lines @@
     } fPLSSetupProgram;
 
     bool fHWPLSEnabled;
     bool fPLSHasBeenUsed;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif