Add the basic code skeleton for system info event router

chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc

Index: chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc
diff --git a/chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc
index 56a7b290d9b9a04261b3a748245e622ca52a6aa9..9e72bea2efd27c56f0531590608a7b8cb2b2e771 100644
--- a/chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc
+++ b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/extensions/api/system_info_storage/storage_info_provider.h"
 
 namespace extensions {
+
 namespace systeminfo {
 
 const char kStorageTypeUnknown[] = "unknown";
@@ -12,4 +13,47 @@ const char kStorageTypeHardDisk[] = "harddisk";
 const char kStorageTypeRemovable[] = "removable";
 
 }  // namespace systeminfo
+
+using api::experimental_system_info_storage::StorageInfo;
+using api::experimental_system_info_storage::StorageUnitInfo;
+using content::BrowserThread;
+
+StorageInfoProvider::StorageInfoProvider()
+    : delegate_(NULL),
+      is_watching_(false) {
+}
+
+StorageInfoProvider::~StorageInfoProvider() {
+  DCHECK(is_watching_) << "Need to call StopWatching before destroying!";
+}
+
+bool StorageInfoProvider::StartWatching(Delegate* delegate) {
+  // Since it always needs a message loop for device notification, we post
+  // the watching task to File thread instead of the worker pool.
+  bool success =
+    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, base::Bind(
+        base::IgnoreResult(&StorageInfoProvider::PlatformStartWatching),
+        base::Unretained(this), delegate));
+
+  return success;
+}
+
+bool StorageInfoProvider::StopWatching() {
+  bool success =
+    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, base::Bind(
+        base::IgnoreResult(&StorageInfoProvider::PlatformStopWatching),
+        base::Unretained(this)));
+
+  return success;
+}
+
+void StorageInfoProvider::OnMediaDeviceAttached(const std::string& id,
+     const string16& name, const FilePath::StringType& location) {
+  // TODO(hongbo): Handle the event of a new storage device attached.
+}
+
+void StorageInfoProvider::OnMediaDeviceDetached(const std::string& id) {
+  // TODO(hongbo): Handle the event of a storage device detached.
+}
+
 }  // namespace extensions