Try TSAN blacklist for SkGLContextHelper::init.

Submitting to test this; this particular problem only happens on the bot.

BUG=skia:
R=mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/309823004

gyp/common_conditions.gypi

@@ -413,7 +413,7 @@
             'conditions' : [
               [ 'skia_sanitizer == "thread"', {
                 'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
-                'cflags': [ '-fPIC' ],
+                'cflags': [ '-fPIC', '-fsanitize-blacklist=>!(pwd)/../tools/tsan.blacklist' ],
                 'target_conditions': [
                   [ '_type == "executable"', {
                     'cflags': [ '-fPIE' ],

tools/tsan.blacklist

@@ -0,0 +1,11 @@
+# Blacklist (compile time suppressions) for TSAN.
+#
+# CAREFUL!  Comments must go on their own line or your suppressions will silently fail.
+
+# skia:2459  Seemingly misdiagnosed use-after-free, having something to do with software GL drivers.
+# Having trouble getting this suppression to match.
+# We've tried: race:swrast_dri.so
+#              race:SkGLContextHelper::init
+#              race:SkGLContextHelper
+# So now we'll try a compile time blacklist.  We'll use a file blacklist to nuke it from orbit.
+file:SkGLContextHelper.cpp

tools/tsan.supp

@@ -5,13 +5,6 @@
 # WebP races (harmlessly) choosing function pointers for SIMD versions of some of its functions.
 race:third_party/externals/libwebp
 
-# skia:2459  Seemingly misdiagnosed use-after-free, having something to do with software GL drivers.
-# Having trouble getting this suppression to match.
-# We've tried: race:swrast_dri.so
-#              race:SkGLContextHelper::init
-# Maybe because it's diagnosed as a use-after-free, not as a race?
-race:SkGLContextHelper
-
 # Threadsafe, should be ported to SkLazyPtr.
 race:SkFontHost_FreeType