Enable overriding interface binders for any services running in current process.

services/service_manager/public/cpp/interface_binder.cc

Index: services/service_manager/public/cpp/interface_binder.cc
diff --git a/services/service_manager/public/cpp/interface_binder.cc b/services/service_manager/public/cpp/interface_binder.cc
index 48a6cd98f10d618130cc77c4377b49bf47a76f1c..81ec6ccc771bbefdf0278c72bfb787d2438e6477 100644
--- a/services/service_manager/public/cpp/interface_binder.cc
+++ b/services/service_manager/public/cpp/interface_binder.cc
@@ -4,6 +4,8 @@
 
 #include "services/service_manager/public/cpp/interface_binder.h"
 
+#include "services/service_manager/public/cpp/bind_source_info.h"
+
 namespace service_manager {
 
 GenericCallbackBinder::GenericCallbackBinder(
@@ -32,4 +34,32 @@ void GenericCallbackBinder::RunCallback(const BindCallback& callback,
   callback.Run(std::move(handle));
 }
 
+FullCallbackBinder::FullCallbackBinder(
+    const BindCallback& callback,
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
+    : callback_(callback), task_runner_(task_runner) {}
+
+FullCallbackBinder::~FullCallbackBinder() {}
+
+void FullCallbackBinder::BindInterface(const BindSourceInfo& source_info,
+                                       const std::string& interface_name,
+                                       mojo::ScopedMessagePipeHandle handle) {
+  if (task_runner_) {
+    task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&FullCallbackBinder::RunCallback, callback_, source_info,
+                   interface_name, base::Passed(&handle)));
+    return;
+  }
+  RunCallback(callback_, source_info, interface_name, std::move(handle));
+}
+
+// static
+void FullCallbackBinder::RunCallback(const BindCallback& callback,
+                                     const BindSourceInfo& source_info,
+                                     const std::string& interface_name,
+                                     mojo::ScopedMessagePipeHandle handle) {
+  callback.Run(source_info, interface_name, std::move(handle));
+}
+
 }  // namespace service_manager