Lazily load extension API schemas

chrome/common/extensions/features/permission_feature.cc

Index: chrome/common/extensions/features/permission_feature.cc
diff --git a/chrome/common/extensions/features/permission_feature.cc b/chrome/common/extensions/features/permission_feature.cc
index b6085d22b122464faea00e1cb1715286d29ee01e..d2c652403387e3b1bbea3308199e4f2d04cf30b9 100644
--- a/chrome/common/extensions/features/permission_feature.cc
+++ b/chrome/common/extensions/features/permission_feature.cc
@@ -15,14 +15,16 @@ PermissionFeature::~PermissionFeature() {
 Feature::Availability PermissionFeature::IsAvailableToContext(
     const Extension* extension,
     Feature::Context context,
+    const GURL& url,
     Feature::Platform platform) const {
   Availability availability = SimpleFeature::IsAvailableToContext(extension,
                                                                   context,
+                                                                  url,
                                                                   platform);
   if (!availability.is_available())
     return availability;
 
-  if (!extension->HasAPIPermission(name()))
+  if (extension && !extension->HasAPIPermission(name()))
     return CreateAvailability(NOT_PRESENT, extension->GetType());
 
   return CreateAvailability(IS_AVAILABLE);