Cache --whitelisted-extension-id in SimpleFeature.

extensions/common/features/simple_feature.h

Index: extensions/common/features/simple_feature.h
diff --git a/extensions/common/features/simple_feature.h b/extensions/common/features/simple_feature.h
index 9d8c539414bb42f775911dbd76fa7c1cbaed192f..84d1de9d4e79acd577d4000f669ca73880f97214 100644
--- a/extensions/common/features/simple_feature.h
+++ b/extensions/common/features/simple_feature.h
@@ -174,6 +174,8 @@ class SimpleFeature : public Feature {
 
   static bool IsValidExtensionId(const std::string& extension_id);
 
+  static bool IsWhitelistedByCommandLine(const std::string& extension_id);

[tapted, 2015/03/31 05:43:30]

dunno why I didn't see this before... but I think this can just be declared in
an anonymous namespace.

(sorry - my brain really isn't working today. I blame jet lag fugue.)

[jackhou1, 2015/03/31 05:56:12]

Nah, I should have noticed it too, sorry.

+
   // For clarity and consistency, we handle the default value of each of these
   // members the same way: it matches everything. It is up to the higher level
   // code that reads Features out of static data to validate that data and set