skia: Add support for CHROMIUM_image backed textures.

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 139 matching lines @@
     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;
     // 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|.
+    bool createTextureImpl(const GrSurfaceDesc& desc, GrGLTextureInfo* info,
+                           bool renderTarget, const void* srcData,
+                           GrGLTexture::TexParams* initialTexParams, size_t rowBytes);
+    bool createTextureExternalAllocatorImpl(const GrSurfaceDesc& desc, GrGLTextureInfo* info,
+                                            const void* srcData, size_t rowBytes);
+
     void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) override;
 
     void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) override;
 
     bool onMakeCopyForTextureParams(GrTexture*, const GrTextureParams&,
                                     GrTextureProducer::CopyParams*) const override;
 
     // Checks whether glReadPixels can be called to get pixel values in readConfig from the
     // render target.
     bool readPixelsSupported(GrRenderTarget* target, GrPixelConfig readConfig);
@@ skipping 135 matching lines @@
     void flushStencil(const GrStencilSettings&);
     void flushHWAAState(GrRenderTarget* rt, bool useHWAA);
 
     // helper for onCreateTexture and writeTexturePixels
     enum UploadType {
         kNewTexture_UploadType,    // we are creating a new texture
         kWrite_UploadType,         // we are using TexSubImage2D to copy data to an existing texture
         kTransfer_UploadType,      // we are using a transfer buffer to copy data
     };
     bool uploadTexData(const GrSurfaceDesc& desc,
-                       GrGLenum target,
+                       GrGLTextureInfo* info,
                        UploadType uploadType,
                        int left, int top, int width, int height,
                        GrPixelConfig dataConfig,
                        const void* data,
                        size_t rowBytes);
 
     // helper for onCreateCompressedTexture. If width and height are
     // set to -1, then this function will use desc.fWidth and desc.fHeight
     // for the size of the data. The isNewTexture flag should be set to true
     // whenever a new texture needs to be created. Otherwise, we assume that
@@ skipping 237 matching lines @@
                 SkFAIL("Unexpected texture target type.");
                 return 0;
         }
     }
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif