[Chromoting] Use device::PowerSaveBlocker to block screen saver

remoting/host/chromoting_host_context.h

 // Copyright (c) 2012 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 REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 #define REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace remoting {
 
 class AutoThreadTaskRunner;
 
 // A class that manages threads and running context for the chromoting host
 // process.  This class is virtual only for testing purposes (see below).
 class ChromotingHostContext {
  public:
-  // Create threads and URLRequestContextGetter for use by a host.
+  // Creates threads and URLRequestContextGetter for use by a host.
   // During shutdown the caller should tear-down the ChromotingHostContext and
   // then continue to run until |ui_task_runner| is no longer referenced.
   // nullptr is returned if any threads fail to start.
   static std::unique_ptr<ChromotingHostContext> Create(
       scoped_refptr<AutoThreadTaskRunner> ui_task_runner);
 
+  // Creates a ChromotingHostContext instance, which uses the input task runner
+  // for all jobs. This is for tests only.
+  static std::unique_ptr<ChromotingHostContext> CreateForTest(
+      scoped_refptr<AutoThreadTaskRunner> task_runner);
+
 #if defined(OS_CHROMEOS)
   // Attaches task runners to the relevant browser threads for the chromoting
   // host.  Must be called on the UI thread of the browser process.
   // remoting::UrlRequestContextGetter returns ContainerURLRequestContext under
   // the hood which spawns two new threads per instance.  Since
   // ChromotingHostContext can be destroyed from any thread, as its owner
   // (It2MeHost) is ref-counted, joining the created threads during shutdown
   // violates the "Disallow IO" thread restrictions on some task runners (e.g.
   // the IO Thread of the browser process).
   // Instead, we re-use the |url_request_context_getter| in the browser process.
   static std::unique_ptr<ChromotingHostContext> CreateForChromeOS(
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
 #endif  // defined(OS_CHROMEOS)
 
   ~ChromotingHostContext();
 
-  std::unique_ptr<ChromotingHostContext> Copy();
+  std::unique_ptr<ChromotingHostContext> Copy() const;
 
   // Task runner for the thread that is used for the UI.
   scoped_refptr<AutoThreadTaskRunner> ui_task_runner() const;
 
   // Task runner for the thread used for audio capture and encoding.
   scoped_refptr<AutoThreadTaskRunner> audio_task_runner() const;
 
   // Task runner for the thread that is used for blocking file
   // IO. This thread is used by the URLRequestContext to read proxy
   // configuration and by NatConfig to read policy configs.
@@ skipping 14 matching lines @@
   // the screen.
   scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner() const;
 
   // Task runner for the thread used to encode video streams.
   scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner() const;
 
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter()
       const;
 
  private:
+  // Creates a ChromotingHostContext instance. Returns nullptr if any of the
+  // input task runner is nullptr.
+  static std::unique_ptr<ChromotingHostContext> Create(
+      scoped_refptr<AutoThreadTaskRunner> ui_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> audio_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> file_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> input_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> network_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner);
+
   ChromotingHostContext(
       scoped_refptr<AutoThreadTaskRunner> ui_task_runner,
       scoped_refptr<AutoThreadTaskRunner> audio_task_runner,
       scoped_refptr<AutoThreadTaskRunner> file_task_runner,
       scoped_refptr<AutoThreadTaskRunner> input_task_runner,
       scoped_refptr<AutoThreadTaskRunner> network_task_runner,
       scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<AutoThreadTaskRunner> video_encode_task_runner,
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
 
@@ skipping 20 matching lines @@
 
   // Serves URLRequestContexts that use the network and UI task runners.
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingHostContext);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_