Lazily load extension API schemas

chrome/common/extensions/features/simple_feature.h

Index: chrome/common/extensions/features/simple_feature.h
diff --git a/chrome/common/extensions/features/simple_feature.h b/chrome/common/extensions/features/simple_feature.h
index 8575f51a4940f6d92318112591131cfa1e4a14b7..d2e40a9f00ee48ec024a18e8f8ab6fcb71d613db 100644
--- a/chrome/common/extensions/features/simple_feature.h
+++ b/chrome/common/extensions/features/simple_feature.h
@@ -54,7 +54,17 @@ class SimpleFeature : public Feature {
 
   Availability IsAvailableToContext(const Extension* extension,
                                     Context context) const {
-    return IsAvailableToContext(extension, context, GetCurrentPlatform());
+    return IsAvailableToContext(extension, context, GURL());
+  }
+  Availability IsAvailableToContext(const Extension* extension,
+                                    Context context,
+                                    Platform platform) const {
+    return IsAvailableToContext(extension, context, GURL(), platform);
+  }
+  Availability IsAvailableToContext(const Extension* extension,
+                                    Context context,
+                                    const GURL& url) const {
+    return IsAvailableToContext(extension, context, url, GetCurrentPlatform());
   }
 
   // extension::Feature:
@@ -66,6 +76,7 @@ class SimpleFeature : public Feature {
 
   virtual Availability IsAvailableToContext(const Extension* extension,
                                             Context context,
+                                            const GURL& url,
                                             Platform platform) const OVERRIDE;
 
   virtual std::string GetAvailabilityMessage(
@@ -87,6 +98,7 @@ class SimpleFeature : public Feature {
   std::set<std::string> whitelist_;
   std::set<Manifest::Type> extension_types_;
   std::set<Context> contexts_;
+  URLPatternSet matches_;
   Location location_;  // we only care about component/not-component now
   Platform platform_;  // we only care about chromeos/not-chromeos now
   int min_manifest_version_;