Reland: Add ETC1 powered SSE encoder for tile texture compression

cc/resources/texture_compressor.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_TEXTURE_COMPRESSOR_H_
 #define CC_RESOURCES_TEXTURE_COMPRESSOR_H_
 
 #include <stdint.h>
 
+#include "base/cpu.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 
 class CC_EXPORT TextureCompressor {
  public:
   enum Format {
     kFormatETC1,
@@ skipping 11 matching lines @@
   virtual void Compress(const uint8_t* src,
                         uint8_t* dst,
                         int width,
                         int height,
                         Quality quality) = 0;
 
  protected:
   TextureCompressor() {}
 
  private:
+  static base::CPU cpu;
   DISALLOW_COPY_AND_ASSIGN(TextureCompressor);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TEXTURE_COMPRESSOR_H_