Add ProcessControlImpl, the default ProcessControl implementation.

content/child/process_control_impl.h

 // Copyright 2015 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.
 
-#ifndef UTILITY_PROCESS_CONTROL_IMPL_H_
-#define UTILITY_PROCESS_CONTROL_IMPL_H_
+#ifndef CONTENT_CHILD_PROCESS_CONTROL_IMPL_H_
+#define CONTENT_CHILD_PROCESS_CONTROL_IMPL_H_
 
 #include <map>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "content/common/process_control.mojom.h"
 #include "mojo/application/public/interfaces/application.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
 
 class GURL;
 
 namespace mojo {
 namespace shell {
 class ApplicationLoader;
 }  // namespace shell
 }  // namespace mojo
 
 namespace content {
 
-// Implementation of the ProcessControl interface. Exposed to the browser via
-// the utility process's ServiceRegistry.
-class UtilityProcessControlImpl : public ProcessControl {
+// Default implementation of the ProcessControl interface.
+class ProcessControlImpl : public ProcessControl {
  public:
-  UtilityProcessControlImpl();
-  ~UtilityProcessControlImpl() override;
+  ProcessControlImpl();
+  ~ProcessControlImpl() override;
 
   using URLToLoaderMap = std::map<GURL, mojo::shell::ApplicationLoader*>;
 
+  // Registers Mojo applications loaders for URLs.
+  virtual void RegisterApplicationLoaders(
+      URLToLoaderMap* url_to_loader_map) = 0;
+
   // ProcessControl:
   void LoadApplication(const mojo::String& url,
                        mojo::InterfaceRequest<mojo::Application> request,
                        const LoadApplicationCallback& callback) override;
 
  private:
+  bool has_registered_loaders_ = false;
   URLToLoaderMap url_to_loader_map_;
 
-  DISALLOW_COPY_AND_ASSIGN(UtilityProcessControlImpl);
+  DISALLOW_COPY_AND_ASSIGN(ProcessControlImpl);
 };
 
 }  // namespace content
 
-#endif  // UTILITY_PROCESS_CONTROL_IMPL_H_
+#endif  // CONTENT_CHILD_PROCESS_CONTROL_IMPL_H_