enable SSE2 in skia/convolver for linux32

skia/ext/convolver.h

 // Copyright (c) 2012 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 SKIA_EXT_CONVOLVER_H_
 #define SKIA_EXT_CONVOLVER_H_
 
 #include <cmath>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/cpu.h"
 #include "third_party/skia/include/core/SkTypes.h"
 
 #if defined(ARCH_CPU_X86_FAMILY)
-// TODO(hclam): SSE2 is disabled on Linux 32-bits because GCC requires -msse2.
-//              We should refactor the code in .cc and enable this.
-#if defined(ARCH_CPU_X86_64) || defined(OS_MACOSX) || defined(COMPILER_MSVC)
 #define SIMD_SSE2 1
 #endif
-#endif
 
 // avoid confusion with Mac OS X's math library (Carbon)
 #if defined(__APPLE__)
 #undef FloatToFixed
 #undef FixedToFloat
 #endif
 
 namespace skia {
 
 // Represents a filter in one dimension. Each output pixel has one entry in this
@@ skipping 132 matching lines @@
                            int source_byte_row_stride,
                            bool source_has_alpha,
                            const ConvolutionFilter1D& xfilter,
                            const ConvolutionFilter1D& yfilter,
                            int output_byte_row_stride,
                            unsigned char* output,
                            bool use_sse2);
 }  // namespace skia
 
 #endif  // SKIA_EXT_CONVOLVER_H_