Add in some infrastructure to make tracing of logical requests broken over async callbacks easier.

remoting/remoting.gyp

 # Copyright (c) 2010 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': {
     'chromium_code': 1,
   },
 
   'target_defaults': {
@@ skipping 98 matching lines @@
 
     {
       'target_name': 'chromoting_base',
       'type': '<(library)',
       'dependencies': [
         '../gfx/gfx.gyp:gfx',
         '../media/media.gyp:media',
         '../third_party/protobuf2/protobuf.gyp:protobuf_lite',
         '../third_party/zlib/zlib.gyp:zlib',
         'base/protocol/chromotocol.gyp:chromotocol_proto_lib',
+        'base/protocol/chromotocol.gyp:trace_proto_lib',
         'chromoting_jingle_glue',
         # TODO(hclam): Enable VP8 in the build.
         #'third_party/on2/on2.gyp:vp8',
       ],
       'export_dependent_settings': [
         '../third_party/protobuf2/protobuf.gyp:protobuf_lite',
         'base/protocol/chromotocol.gyp:chromotocol_proto_lib',
         # TODO(hclam): Enable VP8 in the build.
         #'third_party/on2/on2.gyp:vp8',
       ],
@@ skipping 22 matching lines @@
         'base/encoder_zlib.h',
         # TODO(hclam): Enable VP8 in the build.
         #'base/encoder_vp8.cc',
         #'base/encoder_vp8.h',
         'base/multiple_array_input_stream.cc',
         'base/multiple_array_input_stream.h',
         'base/protocol_decoder.cc',
         'base/protocol_decoder.h',
         'base/protocol_util.cc',
         'base/protocol_util.h',
+        'base/tracer.cc',
+        'base/tracer.h',
         'base/types.h',
       ],
     },  # end of target 'chromoting_base'
 
     {
       'target_name': 'chromoting_host',
       'type': '<(library)',
       'dependencies': [
         'chromoting_base',
         'chromoting_jingle_glue',
@@ skipping 232 matching lines @@
       ],  # end of 'conditions'
     },  # end of target 'chromoting_unittests'
   ],  # end of targets
 }
 
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