Revert of Consolidate GPU buffer implementations

src/gpu/GrIndexBuffer.h

Index: src/gpu/GrIndexBuffer.h
diff --git a/src/gpu/GrIndexBuffer.h b/src/gpu/GrIndexBuffer.h
new file mode 100644
index 0000000000000000000000000000000000000000..2e3b437adfc3712f5500cc62fe554fcf4f4ad961
--- /dev/null
+++ b/src/gpu/GrIndexBuffer.h
@@ -0,0 +1,51 @@
+
+/*
+ * 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 GrIndexBuffer_DEFINED
+#define GrIndexBuffer_DEFINED
+
+#include "GrGeometryBuffer.h"
+
+
+class GrIndexBuffer : 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;
+    }
+
+    /**
+     * Retrieves the maximum number of quads that could be rendered
+     * from the index buffer (using kTriangles_GrPrimitiveType).
+     * @return the maximum number of quads using full size of index buffer.
+     */
+    int maxQuads() const {
+        return static_cast<int>(this->gpuMemorySize() / (sizeof(uint16_t) * 6));
+    }
+protected:
+    GrIndexBuffer(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