Implement <webview>.addContentScript/removeContentScript API [1]

extensions/browser/extension_system.h

Index: extensions/browser/extension_system.h
diff --git a/extensions/browser/extension_system.h b/extensions/browser/extension_system.h
index 400f45e866734c14dba9cbc4d9a25e95ed6b8306..10b0de7080400452652abcef272b770f2f30e985 100644
--- a/extensions/browser/extension_system.h
+++ b/extensions/browser/extension_system.h
@@ -44,6 +44,7 @@ class QuotaService;
 class RuntimeData;
 class SharedUserScriptMaster;
 class StateStore;
+class WebViewContentScriptManager;
 
 // ExtensionSystem manages the lifetime of many of the services used by the
 // extensions and apps system, and it handles startup and shutdown as needed.
@@ -105,6 +106,9 @@ class ExtensionSystem : public KeyedService {
   // Lives on the UI thread. Created at startup.
   virtual QuotaService* quota_service() = 0;
 
+  // The WebViewContentScriptManager is created at startup.
+  virtual WebViewContentScriptManager* web_view_content_script_manager() = 0;
+
   // Called by the ExtensionService that lives in this system. Gives the
   // info map a chance to react to the load event before the EXTENSION_LOADED
   // notification has fired. The purpose for handling this event first is to