The host sends simple log entries to the server.

remoting/remoting.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     # TODO(dmaclach): can we pick this up some other way? Right now it's
     # duplicated from chrome.gyp
     'chromium_code': 1,
     # Use consistent strings across all platforms. Note that the plugin name
@@ skipping 505 matching lines @@
         'host/json_host_config.cc',
         'host/json_host_config.h',
         'host/local_input_monitor.h',
         'host/local_input_monitor_linux.cc',
         'host/local_input_monitor_mac.mm',
         'host/local_input_monitor_thread_linux.cc',
         'host/local_input_monitor_thread_linux.h',
         'host/local_input_monitor_thread_win.cc',
         'host/local_input_monitor_thread_win.h',
         'host/local_input_monitor_win.cc',
+        'host/log_to_server.cc',
+        'host/log_to_server.h',
         'host/register_support_host_request.cc',
         'host/register_support_host_request.h',
         'host/self_access_verifier.cc',
         'host/self_access_verifier.h',
         'host/screen_recorder.cc',
         'host/screen_recorder.h',
+        'host/server_log_entry.cc',
+        'host/server_log_entry.h',
         'host/support_access_verifier.cc',
         'host/support_access_verifier.h',
         'host/ui_strings.cc',
         'host/ui_strings.h',
         'host/user_authenticator.h',
         'host/user_authenticator_linux.cc',
         'host/user_authenticator_mac.cc',
         'host/user_authenticator_win.cc',
       ],
       'conditions': [
@@ skipping 338 matching lines @@
         'host/chromoting_host_context_unittest.cc',
         'host/chromoting_host_unittest.cc',
         'host/client_session_unittest.cc',
         'host/differ_block_unittest.cc',
         'host/differ_unittest.cc',
         'host/heartbeat_sender_unittest.cc',
         'host/host_key_pair_unittest.cc',
         'host/host_mock_objects.cc',
         'host/host_mock_objects.h',
         'host/json_host_config_unittest.cc',
+        'host/log_to_server_unittest.cc',
         'host/register_support_host_request_unittest.cc',
+        'host/screen_recorder_unittest.cc',
         'host/self_access_verifier_unittest.cc',
-        'host/screen_recorder_unittest.cc',
+        'host/server_log_entry_unittest.cc',
         'host/test_key_pair.h',
         'jingle_glue/fake_signal_strategy.cc',
         'jingle_glue/fake_signal_strategy.h',
         'jingle_glue/iq_sender_unittest.cc',
         'jingle_glue/jingle_thread_unittest.cc',
         'jingle_glue/mock_objects.cc',
         'jingle_glue/mock_objects.h',
         'protocol/connection_to_client_unittest.cc',
         'protocol/fake_session.cc',
         'protocol/fake_session.h',
@@ skipping 23 matching lines @@
                   '../base/allocator/allocator.gyp:allocator',
                 ],
               },
             ],
           ],
         }],
       ],  # end of 'conditions'
     },  # end of target 'remoting_unittests'
   ],  # end of targets
 }