Reland 1: Enable overriding interface binders for any services running in current process.

services/service_manager/public/cpp/interface_binder.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/service_manager/public/cpp/interface_binder.h"
 
+#include "services/service_manager/public/cpp/bind_source_info.h"
+
 namespace service_manager {
 
+namespace {
+
+void BindCallbackAdapter(
+    const base::Callback<void(mojo::ScopedMessagePipeHandle)>& callback,
+    const BindSourceInfo& source_info,
+    const std::string& interface_name,
+    mojo::ScopedMessagePipeHandle handle) {
+  callback.Run(std::move(handle));
+}
+
+}  // namespace
+
 GenericCallbackBinder::GenericCallbackBinder(
     const BindCallback& callback,
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
     : callback_(callback), task_runner_(task_runner) {}
 
+GenericCallbackBinder::GenericCallbackBinder(
+    const base::Callback<void(mojo::ScopedMessagePipeHandle)>& callback,
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
+    : callback_(base::Bind(&BindCallbackAdapter, callback)),
+      task_runner_(task_runner) {}
+
 GenericCallbackBinder::~GenericCallbackBinder() {}
 
 void GenericCallbackBinder::BindInterface(
     const BindSourceInfo& source_info,
     const std::string& interface_name,
     mojo::ScopedMessagePipeHandle handle) {
   if (task_runner_) {
     task_runner_->PostTask(
-        FROM_HERE, base::Bind(&GenericCallbackBinder::RunCallback, callback_,
-                              base::Passed(&handle)));
+        FROM_HERE,
+        base::Bind(&GenericCallbackBinder::RunCallback, callback_, source_info,
+                   interface_name, base::Passed(&handle)));
     return;
   }
-  RunCallback(callback_, std::move(handle));
+  RunCallback(callback_, source_info, interface_name, std::move(handle));
 }
 
 // static
 void GenericCallbackBinder::RunCallback(const BindCallback& callback,
+                                        const BindSourceInfo& source_info,
+                                        const std::string& interface_name,
                                         mojo::ScopedMessagePipeHandle handle) {
-  callback.Run(std::move(handle));
+  callback.Run(source_info, interface_name, std::move(handle));
 }
 
 }  // namespace service_manager