Component updater on-demand logic with ResourceThrottle

chrome/browser/component_updater/component_updater_service.h

Index: chrome/browser/component_updater/component_updater_service.h
===================================================================
--- chrome/browser/component_updater/component_updater_service.h	(revision 231370)
+++ chrome/browser/component_updater/component_updater_service.h	(working copy)
@@ -18,8 +18,13 @@
 
 namespace net {
 class URLRequestContextGetter;
+class URLRequest;
 }
 
+namespace content {
+class ResourceThrottle;
+}
+
 class ComponentPatcher;
 
 // Component specific installers must derive from this class and implement
@@ -188,6 +193,12 @@
   // Returns a list of registered components.
   virtual void GetComponents(std::vector<CrxComponentInfo>* components) = 0;
 
+  // Returns a network resource throttle. It means that a component will be
+  // downloaded and installed before the resource is unthrottled. This is the
+  // only function callable from the IO thread.
+  virtual content::ResourceThrottle* GetOnDemandResourceThrottle(
+      net::URLRequest* request, const std::string& crx_id) = 0;
+
   virtual ~ComponentUpdateService() {}
 
   // TODO(waffles): Remove PNaCl as a friend once an alternative on-demand