Reland: Add ETC1 powered SSE encoder for tile texture compression

cc/resources/texture_compressor.cc

 // 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.
 
 #include "cc/resources/texture_compressor.h"
 
 #include "base/logging.h"
 #include "cc/resources/texture_compressor_etc1.h"
+#include "cc/resources/texture_compressor_etc1_sse.h"
 
 namespace cc {
 
 scoped_ptr<TextureCompressor> TextureCompressor::Create(Format format) {
   switch (format) {
     case kFormatETC1:
-      return make_scoped_ptr(new TextureCompressorETC1());
+      if (cpu.has_sse2())
+        return make_scoped_ptr(new TextureCompressorETC1_SSE());
+      else
+        return make_scoped_ptr(new TextureCompressorETC1());

[robert.bradford, 2015/04/17 16:20:08]

What about this instead:

scoped_ptr<TextureCompressor> compressor(new TextureCompressorETC1());

#if defined(__i386__) || defined(__x86_64__)
if (cpu.has_sse2())
  compressor.reset(new TextureCompresorETC1_SSE());
#endif

return compressor;

   }
 
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace cc