Reland: Add ETC1 powered SSE encoder for tile texture compression

cc/resources/texture_compressor.h

Index: cc/resources/texture_compressor.h
diff --git a/cc/resources/texture_compressor.h b/cc/resources/texture_compressor.h
index 18faa40bac5d1dfe547fb7c2249548049f68fbcd..53f9d3cbd545805d15a9425a2b618729d3f716d6 100644
--- a/cc/resources/texture_compressor.h
+++ b/cc/resources/texture_compressor.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include "base/cpu.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ -38,6 +39,7 @@ class CC_EXPORT TextureCompressor {
   TextureCompressor() {}
 
  private:
+  static base::CPU cpu;
   DISALLOW_COPY_AND_ASSIGN(TextureCompressor);
 };