Add blink::ServiceRegistry and expose it from LocalFrame and Platform.

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

Index: third_party/WebKit/Source/platform/exported/Platform.cpp
diff --git a/third_party/WebKit/Source/platform/exported/Platform.cpp b/third_party/WebKit/Source/platform/exported/Platform.cpp
index fc1be64c0e13c2823212981e194de96d581722d6..5f89251a5329aca9b39ed2abd3434304997078a9 100644
--- a/third_party/WebKit/Source/platform/exported/Platform.cpp
+++ b/third_party/WebKit/Source/platform/exported/Platform.cpp
@@ -37,11 +37,19 @@
 #include "platform/heap/GCTaskRunner.h"
 #include "platform/web_memory_dump_provider_adapter.h"
 #include "public/platform/Platform.h"
+#include "public/platform/ServiceRegistry.h"
 #include "public/platform/WebPrerenderingSupport.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
+namespace {
+
+class EmptyServiceRegistry : public ServiceRegistry {
+    void connectToRemoteService(const char* name, mojo::ScopedMessagePipeHandle) override {}
+};
+
+}
 
 static Platform* s_platform = nullptr;
 using ProviderToAdapterMap = HashMap<WebMemoryDumpProvider*, OwnPtr<WebMemoryDumpProviderAdapter>>;
@@ -177,4 +185,10 @@ void Platform::unregisterMemoryDumpProvider(WebMemoryDumpProvider* provider)
     memoryDumpProviders().remove(it);
 }
 
+ServiceRegistry* Platform::serviceRegistry()
+{
+    DEFINE_STATIC_LOCAL(EmptyServiceRegistry, emptyServiceRegistry, ());
+    return &emptyServiceRegistry;
+}
+
 } // namespace blink