Provide access to the ID for the remoted Windows session in the network process

remoting/host/desktop_environment.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_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_DESKTOP_ENVIRONMENT_H_
 
+#include <cstdint>
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
@@ skipping 28 matching lines @@
   virtual std::unique_ptr<webrtc::DesktopCapturer> CreateVideoCapturer() = 0;
   virtual std::unique_ptr<webrtc::MouseCursorMonitor>
   CreateMouseCursorMonitor() = 0;
 
   // Returns the set of all capabilities supported by |this|.
   virtual std::string GetCapabilities() const = 0;
 
   // Passes the final set of capabilities negotiated between the client and host
   // to |this|.
   virtual void SetCapabilities(const std::string& capabilities) = 0;
+
+  // Returns an id which identifies the current desktop session.

[Sergey Ulanov, 2016/06/23 22:35:53]

Please make it clear that this ID is platform-specific and we don't expect it to
be set on all platforms (in which case it's UINT32_MAX)

[joedow, 2016/06/23 23:26:04]

Done.

+  virtual uint32_t GetDesktopSessionId() const = 0;
 };
 
 // Used to create |DesktopEnvironment| instances.
 class DesktopEnvironmentFactory {
  public:
   virtual ~DesktopEnvironmentFactory() {}
 
   // Creates an instance of |DesktopEnvironment|. Returns a nullptr pointer if
   // the desktop environment could not be created for any reason (if the curtain
   // failed to active for instance). |client_session_control| must outlive
   // the created desktop environment.
   virtual std::unique_ptr<DesktopEnvironment> Create(
       base::WeakPtr<ClientSessionControl> client_session_control) = 0;
 
   // Enables or disables the curtain mode.
   virtual void SetEnableCurtaining(bool enable) {}
 
   // Returns |true| if created |DesktopEnvironment| instances support audio
   // capture.
   virtual bool SupportsAudioCapture() const = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_DESKTOP_ENVIRONMENT_H_