Changed api to notify when watched directory is deleted.

chrome/browser/chromeos/extensions/file_manager/event_router.cc

Index: chrome/browser/chromeos/extensions/file_manager/event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/event_router.cc b/chrome/browser/chromeos/extensions/file_manager/event_router.cc
index 9e0604cc8e26b0848f575559e66294274d4872c0..e637899be13b57a2337b8ef02d107fc62d1f54df 100644
--- a/chrome/browser/chromeos/extensions/file_manager/event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/event_router.cc
@@ -386,6 +386,9 @@ EventRouter::EventRouter(Profile* profile)
     : pref_change_registrar_(new PrefChangeRegistrar),
       profile_(profile),
       device_event_router_(new DeviceEventRouterImpl(profile)),
+      dispatch_directory_change_event_impl_(
+          base::Bind(&EventRouter::DispatchDirectoryChangeEventImpl,
+                     base::Unretained(this))),
       weak_factory_(this) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   ObserveEvents();
@@ -712,14 +715,41 @@ void EventRouter::OnDirectoryChanged(const base::FilePath& drive_path) {
 
 void EventRouter::OnFileChanged(const drive::FileChange& changed_files) {
   typedef std::map<base::FilePath, drive::FileChange> FileChangeMap;
+  typedef drive::FileChange::ChangeList::List FileChangeList;
 
   FileChangeMap map;
   const drive::FileChange::Map& changed_file_map = changed_files.map();
   for (drive::FileChange::Map::const_iterator it = changed_file_map.begin();
        it != changed_file_map.end();
        it++) {
+    bool containsDirectoryDeletion = false;
+    const FileChangeList list = it->second.list();
+    for (FileChangeList::const_iterator iter = list.begin();
+         iter != list.end();
+         ++iter) {
+      if (iter->IsDirectory() && iter->IsDelete()) {
+        containsDirectoryDeletion = true;
+        break;
+      }
+    }
+
     const base::FilePath& path = it->first;
     map[path.DirName()].Update(path, it->second);
+
+    // If the change is a deletion of a directory, it may have deleted a
+    // watched directory.
+    // e.g. When /a is deleted, it means /a/b is also deleted.
+    if (containsDirectoryDeletion) {
+      // Expand the deleted directory path with watched paths.
+      for (WatcherMap::const_iterator i = file_watchers_.lower_bound(path);
+        i != file_watchers_.end() &&
+        i->first.value().find(path.value()) == 0;
+        ++i) {
+        // Set an empty change list.
+        drive::FileChange::ChangeList change_list;
+        map[i->first].Update(i->first, change_list);
+      }
+    }
   }
 
   for (FileChangeMap::const_iterator it = map.begin(); it != map.end(); it++) {
@@ -791,6 +821,15 @@ void EventRouter::DispatchDirectoryChangeEvent(
     const drive::FileChange* list,
     bool got_error,
     const std::vector<std::string>& extension_ids) {
+  dispatch_directory_change_event_impl_.Run(virtual_path,
+                                            list, got_error, extension_ids);
+}
+
+void EventRouter::DispatchDirectoryChangeEventImpl(
+    const base::FilePath& virtual_path,
+    const drive::FileChange* list,
+    bool got_error,
+    const std::vector<std::string>& extension_ids) {
   if (!profile_) {
     NOTREACHED();
     return;
@@ -967,4 +1006,9 @@ void EventRouter::Observe(int type,
   }
 }
 
+void EventRouter::SetDispatchDirectoryChangeEventImplForTesting(
+    const DispatchDirectoryChangeEventImplCallback& callback) {
+  dispatch_directory_change_event_impl_ = callback;
+}
+
 }  // namespace file_manager