Beginning of support for extension content verification

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 1ccccddb2dfe996454be30a7205f11afeb8e3fe5..5be81853f45a1fc988d2d21b30b218b98aba380c 100644
--- a/extensions/browser/extension_system.h
+++ b/extensions/browser/extension_system.h
@@ -26,6 +26,7 @@ class BrowserContext;
 namespace extensions {
 
 class Blacklist;
+class ContentVerifier;
 class ErrorConsole;
 class EventRouter;
 class Extension;
@@ -124,6 +125,9 @@ class ExtensionSystem : public KeyedService {
 
   // Signaled when the extension system has completed its startup tasks.
   virtual const OneShotEvent& ready() const = 0;
+
+  // Returns the content verifier, if any.
+  virtual ContentVerifier* content_verifier();
 };
 
 }  // namespace extensions