Add option to export tracing events to ETW.

base/trace_event/etw_manifest/etw_manifest.gyp

+# 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.
+{
+  'targets': [
+    {
+      # GN version: //base/trace_event/etw_manifest/BUILD.gn
+      'target_name': 'etw_manifest',
+      'type': 'static_library',
+          'conditions': [
+                ['OS=="win"', {
+                  'sources': [
+                        'chrome_events_win.man',
+                  ],
+                  'variables': {
+                          'man_output_dir': '<(SHARED_INTERMEDIATE_DIR)/base/trace_event/etw_manifest',
+                  },
+                  'rules': [{
+                        # Rule to run the message compiler.
+                        'rule_name': 'message_compiler',
+                        'extension': 'man',
+                        'outputs': [
+                          '<(man_output_dir)/chrome_events_win.h',
+                          '<(man_output_dir)/chrome_events_win.rc',
+                        ],
+                        'action': [
+                          'mc.exe',
+                          '-h', '<(man_output_dir)',
+                          '-r', '<(man_output_dir)/.',
+                          '-um',
+                          '<(RULE_INPUT_PATH)',
+                        ],
+                        'process_outputs_as_sources': 1,
+                        'message': 'Running message compiler on <(RULE_INPUT_PATH)',
+                 }],
+                }],
+          ],
+        }
+  ]
+}