Track GL buffer state based on unique resource ID

src/gpu/gl/GrGLBuffer.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLBuffer_DEFINED
 #define GrGLBuffer_DEFINED
 
 #include "GrBuffer.h"
 #include "gl/GrGLTypes.h"
 
 class GrGLGpu;
 class GrGLCaps;
 
 class GrGLBuffer : public GrBuffer {
 public:
-    static GrGLBuffer* Create(GrGLGpu*, GrBufferType, size_t size, GrAccessPattern);
+    static GrGLBuffer* Create(GrGLGpu*, size_t size, GrBufferType intendedType, GrAccessPattern,
+                              const void* data = nullptr);
 
     ~GrGLBuffer() {
         // either release or abandon should have been called by the owner of this object.
         SkASSERT(0 == fBufferID);
     }
 
-    GrGLenum target() const { return fTarget; }
     GrGLuint bufferID() const { return fBufferID; }
     size_t baseOffset() const { return reinterpret_cast<size_t>(fCPUData); }
 
 protected:
-    GrGLBuffer(GrGLGpu*, GrBufferType, size_t size, GrAccessPattern, bool cpuBacked);
+    GrGLBuffer(GrGLGpu*, size_t size, GrBufferType intendedType, GrAccessPattern, bool cpuBacked,
+               const void* data);
 
     void onAbandon() override;
     void onRelease() override;
     void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                           const SkString& dumpName) const override;
 
 private:
     GrGLGpu* glGpu() const;
     const GrGLCaps& glCaps() const;
 
     void onMap() override;
     void onUnmap() override;
     bool onUpdateData(const void* src, size_t srcSizeInBytes) override;
 
 #ifdef SK_DEBUG
     void validate() const;
 #endif
 
-    void*        fCPUData;
-    GrGLenum     fTarget; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER, e.g.
-    GrGLuint     fBufferID;
-    size_t       fSizeInBytes;
-    GrGLenum     fUsage;
-    size_t       fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
-                                     // smaller or larger than the size in fDesc.
+    void*          fCPUData;
+    GrBufferType   fIntendedType;
+    GrGLuint       fBufferID;
+    size_t         fSizeInBytes;
+    GrGLenum       fUsage;
+    size_t         fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
+                                       // smaller or larger than the size in fDesc.
 
     typedef GrBuffer INHERITED;
 };
 
 #endif