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

remoting/base/protocol/chromotocol.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,
     'out_dir': '<(SHARED_INTERMEDIATE_DIR)/protoc_out/remoting/base/protocol',
   },
   'targets': [
@@ skipping 51 matching lines @@
       'direct_dependent_settings': {
         'include_dirs': [
           '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
         ],
       },
       'sources': [
         '<(out_dir)/chromotocol.pb.cc',
         '<(out_dir)/chromotocol.pb.h',
       ],
     },
+
+    {
+      # Protobuf compiler / generate rule for trace.proto.
+      'target_name': 'trace_proto',
+      'type': 'none',
+      'sources': [
+        'trace.proto',
+      ],
+      'rules': [
+        {
+          'rule_name': 'genproto',
+          'extension': 'proto',
+          'inputs': [
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/pyproto/<(RULE_INPUT_ROOT)_pb/'
+               '<(RULE_INPUT_ROOT)_pb2.py',
+            '<(out_dir)/<(RULE_INPUT_ROOT).pb.cc',
+            '<(out_dir)/<(RULE_INPUT_ROOT).pb.h',
+          ],
+          'action': [
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+            '--proto_path=.',
+            './<(RULE_INPUT_ROOT)<(RULE_INPUT_EXT)',
+            '--cpp_out=<(out_dir)',
+            '--python_out=<(PRODUCT_DIR)/pyproto/<(RULE_INPUT_ROOT)_pb',
+          ],
+          'message': 'Generating C++ and Python code from <(RULE_INPUT_PATH)',
+        },
+      ],
+      'dependencies': [
+        '../../../third_party/protobuf2/protobuf.gyp:protoc#host',
+      ],
+      # This target exports a hard dependency because it generates header
+      # files.
+      'hard_dependency': 1,
+    },
+
+    {
+      'target_name': 'trace_proto_lib',
+      'type': '<(library)',
+      'export_dependent_settings': [
+        '../../../third_party/protobuf2/protobuf.gyp:protobuf_lite',
+        'trace_proto',
+      ],
+      'dependencies': [
+        '../../../third_party/protobuf2/protobuf.gyp:protobuf_lite',
+        'trace_proto',
+      ],
+      # This target exports a hard dependency because depedents require
+      # chromotocol_proto to compile.
+      'hard_dependency': 1,
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
+        ],
+      },
+      'sources': [
+        '<(out_dir)/trace.pb.cc',
+        '<(out_dir)/trace.pb.h',
+      ],
+    },
   ],
 }
 
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