Convert MimeRegistry to use mojo.

content/common/mojo/service_registry_impl.cc

Index: content/common/mojo/service_registry_impl.cc
diff --git a/content/common/mojo/service_registry_impl.cc b/content/common/mojo/service_registry_impl.cc
index d5e48f1991abc7d2590d4deae94569f65142e092..39e575a70209a0b5d2d4a786fed4effcb4d1b267 100644
--- a/content/common/mojo/service_registry_impl.cc
+++ b/content/common/mojo/service_registry_impl.cc
@@ -42,9 +42,12 @@ void ServiceRegistryImpl::BindRemoteServiceProvider(
   }
 }
 
-void ServiceRegistryImpl::AddService(const std::string& service_name,
-                                     const ServiceFactory& service_factory) {
-  service_factories_[service_name] = service_factory;
+void ServiceRegistryImpl::AddService(
+    const std::string& service_name,
+    const ServiceFactory& service_factory,
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
+  service_factories_[service_name] =
+      std::make_pair(service_factory, task_runner);
 }
 
 void ServiceRegistryImpl::RemoveService(const std::string& service_name) {
@@ -103,7 +106,21 @@ void ServiceRegistryImpl::GetInterface(
     return;
   }
 
-  it->second.Run(std::move(client_handle));
+  if (it->second.second) {
+    it->second.second->PostTask(
+        FROM_HERE,
+        base::Bind(&ServiceRegistryImpl::RunServiceFactoryOnTaskRunner,
+                   it->second.first, base::Passed(&client_handle)));
+    return;
+  }
+  it->second.first.Run(std::move(client_handle));
+}
+
+// static
+void ServiceRegistryImpl::RunServiceFactoryOnTaskRunner(
+    const ServiceRegistryImpl::ServiceFactory& factory,
+    mojo::ScopedMessagePipeHandle handle) {
+  factory.Run(std::move(handle));

[nasko, 2016/06/02 21:31:41]

More for my own education - where does Mojo guarantee that object constructed on
a specific thread is only called on the same thread?

[Sam McNally, 2016/06/02 23:49:39]

https://code.google.com/p/chromium/codesearch/#chromium/src/mojo/public/cpp/b...

 }
 
 void ServiceRegistryImpl::OnConnectionError() {