Split atomic and mutex implementations and make inlinable.

gyp/core.gypi

 # Include this gypi to include all 'core' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
 #
 {
     'sources': [
         '<(skia_src_path)/core/ARGB32_Clamp_Bilinear_BitmapShader.h',
@@ skipping 274 matching lines @@
         '<(skia_include_path)/core/SkTArray.h',
         '<(skia_include_path)/core/SkTDArray.h',
         '<(skia_include_path)/core/SkTDStack.h',
         '<(skia_include_path)/core/SkTDict.h',
         '<(skia_include_path)/core/SkTInternalLList.h',
         '<(skia_include_path)/core/SkTileGridPicture.h',
         '<(skia_include_path)/core/SkTRegistry.h',
         '<(skia_include_path)/core/SkTSearch.h',
         '<(skia_include_path)/core/SkTemplates.h',
         '<(skia_include_path)/core/SkThread.h',
-        '<(skia_include_path)/core/SkThread_platform.h',
         '<(skia_include_path)/core/SkTime.h',
         '<(skia_include_path)/core/SkTLazy.h',
         '<(skia_include_path)/core/SkTrace.h',
         '<(skia_include_path)/core/SkTypeface.h',
         '<(skia_include_path)/core/SkTypes.h',
         '<(skia_include_path)/core/SkUnPreMultiply.h',
         '<(skia_include_path)/core/SkUnitMapper.h',
         '<(skia_include_path)/core/SkUtils.h',
         '<(skia_include_path)/core/SkWeakRefCnt.h',
         '<(skia_include_path)/core/SkWriter32.h',
@@ skipping 69 matching lines @@
         '<(skia_src_path)/pathops/SkQuarticRoot.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }
 
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