Refactor Blink's ServiceConnector and add ability to mock in layout tests

third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp

Index: third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp
diff --git a/third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp b/third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp
index b649b3013749c0036478b3dde8773045a59865e8..9689eaf51d8c2d6037c546f61f895c9655b6696d 100644
--- a/third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp
+++ b/third_party/WebKit/Source/platform/exported/ServiceRegistry.cpp
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "public/platform/Connector.h"
 #include "public/platform/InterfaceProvider.h"
 
 #include "wtf/StdLibExtras.h"
@@ -9,11 +10,22 @@
 namespace blink {
 namespace {
 
+class EmptyConnector : public Connector {
+  void bindInterface(const char* serviceName,
+                     const char* interfaceName,
+                     mojo::ScopedMessagePipeHandle) override {}
+};
+
 class EmptyInterfaceProvider : public InterfaceProvider {
   void getInterface(const char* name, mojo::ScopedMessagePipeHandle) override {}
 };
 }
 
+Connector* Connector::getEmptyConnector() {
+  DEFINE_STATIC_LOCAL(EmptyConnector, emptyConnector, ());
+  return &emptyConnector;
+}
+
 InterfaceProvider* InterfaceProvider::getEmptyInterfaceProvider() {
   DEFINE_STATIC_LOCAL(EmptyInterfaceProvider, emptyInterfaceProvider, ());
   return &emptyInterfaceProvider;