Allow API functions and events to have entries in _api_features.json

chrome/common/extensions/api/extension_api.h

Index: chrome/common/extensions/api/extension_api.h
diff --git a/chrome/common/extensions/api/extension_api.h b/chrome/common/extensions/api/extension_api.h
index 1486489ccb88ab1c09e4f7229a84da728833868b..6b68fe62772e062e499e8ded9da67edc711378bf 100644
--- a/chrome/common/extensions/api/extension_api.h
+++ b/chrome/common/extensions/api/extension_api.h
@@ -76,6 +76,12 @@ class ExtensionAPI {
                                     Feature::Context context,
                                     const GURL& url);
 
+  // Determines whether an API, or any parts of that API, are available in
+  // |context|.
+  Feature::Availability IsPartAvailableToContext(const std::string& api_name,
+                                                 Feature::Context context,
+                                                 const GURL& url);
+
   // Returns true if |name| is a privileged API path. Privileged paths can only
   // be called from extension code which is running in its own designated
   // extension process. They cannot be called from extension code running in