Browser watcher first installment.

components/browser_watcher.gypi

Index: components/browser_watcher.gypi
diff --git a/components/browser_watcher.gypi b/components/browser_watcher.gypi
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+# Copyright (c) 2014 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.
+
+{
+  'conditions': [
+  ['OS=="win"', {
+      'targets': [
+          {
+            'target_name': 'browser_watcher_lib',
+            'type': 'static_library',
+            'sources': [
+              'browser_watcher/watcher_win.cc',
+              'browser_watcher/watcher_win.h',
+            ],
+            'dependencies': [
+              '../base/base.gyp:base',
+            ],
+          },
+        ],
+      }
+    ],
+  ],
+}