[remoting android] Add and build host code.

remoting/host/host_details.cc

 // 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.
 
 #include "remoting/host/host_details.h"
 
 #include "base/sys_info.h"
 #include "build/build_config.h"
 
 #if defined(OS_LINUX)
 #include "base/linux_util.h"
 #endif
 
 namespace remoting {
 
 // Get the host Operating System Name, removing the need to check for OS
 // definitions and keeps the keys used consistant.
 std::string GetHostOperatingSystemName() {
 #if defined(OS_WIN)
   return "Windows";
 #elif defined(OS_MACOSX)
   return "Mac";
 #elif defined(OS_CHROMEOS)
   return "ChromeOS";
 #elif defined(OS_LINUX)
   return "Linux";
+#elif defined(OS_ANDROID)
+  return "Android";
+#else
+#error "Unsupported host OS"
 #endif
 }
 
 // Get the host Operating System Version, removing the need to check for OS
 // definitions and keeps the format used consistant.
 std::string GetHostOperatingSystemVersion() {
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
+#if defined(OS_LINUX)
+  return base::GetLinuxDistro();
+#else
   return base::SysInfo::OperatingSystemVersion();
-#elif defined(OS_LINUX)
-  return base::GetLinuxDistro();
 #endif
 }
 
 }  // namespace remoting