Fix broken android framework builds where 32-bit MIPS compilers lack 64-bit __sync operators.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
     'SK_SUPPORT_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
     'SK_FORCE_DISTANCEFIELD_FONTS=<(skia_force_distancefield_fonts)',
   ],
   'conditions' : [
@@ skipping 348 matching lines @@
         'SK_USE_FREETYPE_EMBOLDEN',
         'SK_SFNTLY_SUBSETTER "sample/chromium/font_subsetter.h"',
         # When built as part of the system image we can enable certian non-NDK
         # compliant optimizations.
         'SK_BUILD_FOR_ANDROID_FRAMEWORK',
         # Optimizations for chromium (m30)
         'GR_GL_CUSTOM_SETUP_HEADER "gl/GrGLConfig_chrome.h"',
         'IGNORE_ROT_AA_RECT_OPT',
         'SkLONGLONG int64_t',
         'SK_DEFAULT_FONT_CACHE_LIMIT   (768 * 1024)',
-        'SK_ATOMICS_PLATFORM_H "../../src/ports/SkAtomics_sync.h"',
-        'SK_MUTEX_PLATFORM_H "../../src/ports/SkMutex_pthread.h"',
         # Transitional, for deprecated SkCanvas::SaveFlags methods.
         'SK_ATTR_DEPRECATED=SK_NOTHING_ARG1',
         'SK_SUPPORT_LEGACY_SHADER_LOCALMATRIX',
         'SK_DEFAULT_GLOBAL_DISCARDABLE_MEMORY_POOL_SIZE (512 * 1024)',
         'SK_IGNORE_ETC1_SUPPORT',
         # Defines from skia_for_android_framework_defines.gypi
         '<@(skia_for_android_framework_defines)',
       ],
     }],
 
@@ skipping 314 matching lines @@
     [ 'skia_crash_handler', {
       'defines': [ 'SK_CRASH_HANDLER' ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }