sk_tool_utils_flags.cpp depends on GetResourcePath

BUG=skia:
R=caryclark@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/432033002
diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index cb54fee..e2e12bf 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -98,6 +98,7 @@
         '../src/fonts',
       ],
       'dependencies': [
+        'resources',
         'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
       ],