[fsp] Add support for observing entries and notifying about changes.

chrome/browser/chromeos/file_system_provider/provided_file_system_info.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h b/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
index 60b80fd027df3ef6fa67a52cc65cc12f17e70fc2..b863ed7d6edf4fbb41c4f70c7b61a2296243a628 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
@@ -19,7 +19,8 @@ class ProvidedFileSystemInfo {
   ProvidedFileSystemInfo(const std::string& extension_id,
                          const std::string& file_system_id,
                          const std::string& display_name,
-                         const bool writable,
+                         bool writable,
+                         bool supports_notify_tag,
                          const base::FilePath& mount_path);
 
   ~ProvidedFileSystemInfo();
@@ -28,6 +29,7 @@ class ProvidedFileSystemInfo {
   const std::string& file_system_id() const { return file_system_id_; }
   const std::string& display_name() const { return display_name_; }
   bool writable() const { return writable_; }
+  bool supports_notify_tag() const { return supports_notify_tag_; }
   const base::FilePath& mount_path() const { return mount_path_; }
 
  private:
@@ -43,6 +45,9 @@ class ProvidedFileSystemInfo {
   // Whether the file system is writable or just read-only.
   bool writable_;
 
+  // Supports tags for file/directory change notifications.
+  bool supports_notify_tag_;
+
   // Mount path of the underlying file system.
   base::FilePath mount_path_;
 };