ARM Skia NEON patches - 35 - First AArch64 support

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_DISTANCEFIELD_FONTS=<(skia_distancefield_fonts)',
   ],
   'conditions' : [
+    [ 'skia_arch_type == "arm64"', {
+      'cflags': [
+        '-ffp-contract=off',

[hal.canary, 2014/03/20 13:55:27]

Why are you adding this?  We don't use this for any other arch.

[djsollen, 2014/03/20 14:40:16]

What test fails? Does the test only fail in release or debug mode? or both?  We
want to go the fast route and we tolerate these differences on x86 between 32
and 64-bit build so we should have tolerance here as well.

[kevin.petit, 2014/03/20 16:05:09]

It was MatrixTest failing only in release mode.

+      ],
+    }],
+
     [ 'skia_os == "win"',
       {
         'defines': [
           'SK_BUILD_FOR_WIN32',
           '_CRT_SECURE_NO_WARNINGS',
           'GR_GL_FUNCTION_TYPE=__stdcall',
         ],
         'msvs_cygwin_shell': 0,
         'msvs_settings': {
           'VCCLCompilerTool': {
@@ skipping 481 matching lines @@
       'defines': [
         'SK_USE_POSIX_THREADS',
       ],
     }],
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }