Factor out skia_keep_frame_pointer. Handy with perf to get call stacks.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
         'defines': [
@@ skipping 262 matching lines @@
                 'ldflags': [
                   '-m32',
                 ],
               }],
             ],
           }],
           # Enable asan, tsan, etc.
           [ 'skia_sanitizer', {
             'cflags': [
               '-fsanitize=<(skia_sanitizer)',
-              '-fno-omit-frame-pointer',
             ],
             'ldflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'conditions' : [
               [ 'skia_sanitizer == "thread"', {
                 'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
                 'cflags': [ '-fPIC' ],
                 'target_conditions': [
                   [ '_type == "executable"', {
                     'cflags': [ '-fPIE' ],
                     'ldflags': [ '-pie' ],
                   }],
                 ],
               }],
             ],
           }],
           [ 'skia_clang_build', {
             'cflags': [
               # Extra warnings we like but that only Clang knows about.
               '-Wstring-conversion',
             ],
           }],
+          [ 'skia_keep_frame_pointer', {
+            'cflags': [ '-fno-omit-frame-pointer' ],
+          }],
         ],
       },
     ],
 
     [ 'skia_os == "mac"',
       {
         'variables': {
           'mac_sdk%': '<!(python <(DEPTH)/tools/find_mac_sdk.py 10.6)',
         },
         'defines': [
@@ skipping 182 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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