First cut at the component observer.

chrome/browser/component_updater/test/component_updater_service_unittest.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_COMPONENT_UPDATER_TEST_COMPONENT_UPDATER_SERVICE_UNITTEST_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_TEST_COMPONENT_UPDATER_SERVICE_UNITTEST_H_
 
 #include <list>
 #include <map>
 #include <string>
 #include <utility>
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/component_updater/test/component_patcher_mock.h"
 #include "chrome/browser/component_updater/test/url_request_post_interceptor.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_notification_tracker.h"
 #include "net/url_request/url_request_test_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class TestInstaller;
 
 // component 1 has extension id "jebgalgnebhfojomionfpkfelancnnkf", and
 // the RSA public key the following hash:
 const uint8 jebg_hash[] = {0x94, 0x16, 0x0b, 0x6d, 0x41, 0x75, 0xe9, 0xec,
                            0x8e, 0xd5, 0xfa, 0x54, 0xb0, 0xd2, 0xdd, 0xa5,
                            0x6e, 0x05, 0x6b, 0xe8, 0x73, 0x47, 0xf6, 0xc4,
                            0x11, 0x9f, 0xbc, 0xb3, 0x09, 0xb3, 0x5b, 0x40};
@@ skipping 123 matching lines @@
     return num_misses_;
   }
 
  private:
   int num_hits_;
   int num_misses_;
   const std::map<std::string, std::string> attributes_;
   virtual bool Test(net::URLRequest* request);
 };
 
+class MockComponentObserver : public ComponentObserver {
+ public:
+  MockComponentObserver();
+  ~MockComponentObserver();
+  MOCK_METHOD2(OnEvent, void(Events event, int extra));
+};
+
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_TEST_COMPONENT_UPDATER_SERVICE_UNITTEST_H_