Add the basic code skeleton for system info event router

chrome/browser/extensions/api/system_info_storage/storage_info_provider_win.h

Index: chrome/browser/extensions/api/system_info_storage/storage_info_provider_win.h
diff --git a/chrome/browser/extensions/api/system_info_storage/storage_info_provider_win.h b/chrome/browser/extensions/api/system_info_storage/storage_info_provider_win.h
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index 0000000000000000000000000000000000000000..8db8ee856b6755a8b88fb3fa835e26f1742c0d5b
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+++ b/chrome/browser/extensions/api/system_info_storage/storage_info_provider_win.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2012 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_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_WIN_H_
+#define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_WIN_H_
+
+#include "chrome/browser/extensions/api/system_info_storage/storage_info_provider.h"
+
+#include <map>
+#include <windows.h>
+
+#include "base/win/object_watcher.h"
+
+namespace extensions {
+
+// StorageInfoProvider implementation on Windows platform.
+class StorageInfoProviderWin
+    : public StorageInfoProvider,
+      public base::win::ObjectWatcher::Delegate {
+ public:
+  StorageInfoProviderWin();
+  virtual ~StorageInfoProviderWin();
+
+  // Overriden from StorageInfoProvider.
+  virtual bool QueryInfo(
+      api::experimental_system_info_storage::StorageInfo* info) OVERRIDE;
+  virtual bool QueryUnitInfo(const FilePath::StringType& path,
+      api::experimental_system_info_storage::StorageUnitInfo* info) OVERRIDE;
+
+ private:
+  struct StorageWatcherEntry {
+    string16 path;
+    base::win::ObjectWatcher watcher;
+  };
+  typedef std::map<HANDLE, linked_ptr<StorageWatcherEntry> > StorageWatcherMap;
+
+  // Overriden from StorageInfoProvider.
+  virtual bool PlatformStartWatching(
+      StorageInfoProvider::Delegate* delegate) OVERRIDE;
+  virtual bool PlatformStopWatching() OVERRIDE;
+
+  // Overriden from base::win::ObjectWatcher::Delegate
+  virtual void OnObjectSignaled(HANDLE handle) OVERRIDE;
+
+  // Map the HANDLE object that is used to find the change notification and
+  // its watcher entry. Once the HANDLE object gets signaled, we can know
+  // quickly the changes happened on which storage device.
+  StorageWatcherMap storage_watchers_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_WIN_H_