Enable -fPIE and -pie in tsan build.

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 271 matching lines @@
             'cflags': [
               '-fsanitize=<(skia_sanitizer)',
               '-fno-omit-frame-pointer',
             ],
             'ldflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'conditions' : [
               [ 'skia_sanitizer == "thread"', {
                 'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
+                'target_conditions': [
+                  [ '_type == "executable"', {
+                    'cflags': [ '-fPIE' ],
+                    'ldflags': [ '-pie' ],
+                  }],
+                ],
               }],
             ],
           }],
           [ 'skia_clang_build', {
             'cflags': [
               # Extra warnings we like but that only Clang knows about.
               '-Wstring-conversion',
             ],
           }],
         ],
@@ skipping 191 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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