Lazy load chrome.* APIs

chrome/renderer/extensions/chrome_v8_context.h

Index: chrome/renderer/extensions/chrome_v8_context.h
diff --git a/chrome/renderer/extensions/chrome_v8_context.h b/chrome/renderer/extensions/chrome_v8_context.h
index 8c71c047c2d1b751a7dcc0737868970c65841c7f..f80da468d7ba6b3b4306db8640a6c6bb309d77db 100644
--- a/chrome/renderer/extensions/chrome_v8_context.h
+++ b/chrome/renderer/extensions/chrome_v8_context.h
@@ -100,6 +100,8 @@ class ChromeV8Context {
   // APIs are available, returns an empty set.
   const std::set<std::string>& GetAvailableExtensionAPIs();
 
+  Feature::Availability GetAvailability(const std::string& api_name);
+
   // Returns a string description of the type of context this is.
   std::string GetContextTypeDescription();
 
@@ -128,7 +130,8 @@ class ChromeV8Context {
   scoped_ptr<ModuleSystem> module_system_;
 
   // The extension APIs available to this context.
-  scoped_ptr<std::set<std::string> > available_extension_apis_;
+  std::set<std::string> available_extension_apis_;
+  bool available_extension_apis_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeV8Context);
 };