Fix iOS build by centralizing --writePath.
CQ_EXTRA_TRYBOTS=tryserver.skia:Build-Mac10.7-Clang-Arm7-Debug-iOS-Trybot
BUG=skia:
R=mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/452633002
diff --git a/tools/flags/SkCommonFlags.h b/tools/flags/SkCommonFlags.h
index 4abf201..b45ef07 100644
--- a/tools/flags/SkCommonFlags.h
+++ b/tools/flags/SkCommonFlags.h
@@ -26,5 +26,6 @@
DECLARE_string(resourcePath);
DECLARE_bool(verbose);
DECLARE_bool(veryVerbose);
+DECLARE_string(writePath);
#endif