Revert of Consolidate GPU buffer implementations

src/gpu/GrVertexBuffer.h

+
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+
+#ifndef GrVertexBuffer_DEFINED
+#define GrVertexBuffer_DEFINED
+
+#include "GrGeometryBuffer.h"
+
+class GrVertexBuffer : public GrGeometryBuffer {
+public:
+    static void ComputeScratchKey(size_t size, bool dynamic, GrScratchKey* key) {
+        static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateResourceType();
+
+        GrScratchKey::Builder builder(key, kType, 2);
+
+        builder[0] = SkToUInt(size);
+        builder[1] = dynamic ? 1 : 0;
+    }
+
+protected:
+    GrVertexBuffer(GrGpu* gpu, size_t gpuMemorySize, bool dynamic, bool cpuBacked)
+        : INHERITED(gpu, gpuMemorySize, dynamic, cpuBacked) {
+        // We currently only make buffers scratch if they're both pow2 sized and not cpuBacked.
+        if (!cpuBacked && SkIsPow2(gpuMemorySize)) {
+            GrScratchKey key;
+            ComputeScratchKey(gpuMemorySize, dynamic, &key);
+            this->setScratchKey(key);
+        }
+    }
+
+private:
+    typedef GrGeometryBuffer INHERITED;
+};
+
+#endif