Promote {Add,Clear}ServiceOverrideForTesting to ServiceRegistry public interface.

content/public/common/service_registry.h

Index: content/public/common/service_registry.h
diff --git a/content/public/common/service_registry.h b/content/public/common/service_registry.h
index ad8aaf0dadac407f61959539f6341c6e49e6980f..41edc199ce7a78992a03e9e732b8f0e452a811f5 100644
--- a/content/public/common/service_registry.h
+++ b/content/public/common/service_registry.h
@@ -60,6 +60,18 @@ class CONTENT_EXPORT ServiceRegistry {
   virtual void ConnectToRemoteService(const base::StringPiece& name,
                                       mojo::ScopedMessagePipeHandle handle) = 0;
 
+  // Registers a local service factory to intercept ConnectToRemoteService
+  // requests instead of actually connecting to the remote registry. Used only
+  // for testing.
+  virtual void AddServiceOverrideForTesting(
+      const std::string& service_name,
+      const base::Callback<void(mojo::ScopedMessagePipeHandle)>&
+          service_factory) = 0;
+
+  // Removes all local service factories registered
+  // by AddServiceOverrideForTesting. Used only for testing.
+  virtual void ClearServiceOverridesForTesting() = 0;
+
  private:
   template <typename Interface>
   static void ForwardToServiceFactory(