Look at DYNAMIC_ANNOTATIONS_ENABLED now.

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_DISTANCE_FIELD_TEXT=<(skia_force_distance_field_text)',
   ],
   'conditions' : [
@@ skipping 441 matching lines @@
           # Enable asan, tsan, etc.
           [ 'skia_sanitizer', {
             'cflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'ldflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'conditions' : [
               [ 'skia_sanitizer == "thread"', {
-                'defines': [ 'SK_DYNAMIC_ANNOTATIONS_ENABLED=1' ],
+                'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
               }],
               [ 'skia_sanitizer == "undefined"', {
                 'cflags_cc!': ['-fno-rtti'],
               }],
             ],
           }],
           [ 'skia_clang_build', {
             'cflags_cc': [
                 # Build in C++11 mode to make sure we'll have an easy time switching.
                 '-std=c++11',
@@ skipping 176 matching lines @@
     [ 'skia_is_bot', {
       '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',
   },
 }