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

chrome/browser/chromeos/file_system_provider/provided_file_system.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system.h b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
index ce896bd5836dbe723658024e8baf874ec3031b35..799d9cc9f700f1ad53ed72f6bb890128aa550cee 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 #include "chrome/browser/chromeos/file_system_provider/request_manager.h"
@@ -89,8 +90,19 @@ class ProvidedFileSystem : public ProvidedFileSystemInterface {
       int64 offset,
       int length,
       const storage::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
+  virtual AbortCallback ObserveDirectory(
+      const base::FilePath& directory_path,
+      bool recursive,
+      const storage::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
+  virtual AbortCallback UnobserveEntry(
+      const base::FilePath& entry_path,
+      const storage::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const OVERRIDE;
   virtual RequestManager* GetRequestManager() OVERRIDE;
+  virtual ObservedEntries* GetObservedEntries() OVERRIDE;
+  virtual void AddObserver(Observer* observer) OVERRIDE;
+  virtual void RemoveObserver(Observer* observer) OVERRIDE;
+  virtual ObserverList<Observer>* GetObservers() OVERRIDE;
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() OVERRIDE;
 
  private:
@@ -100,11 +112,20 @@ class ProvidedFileSystem : public ProvidedFileSystemInterface {
   void Abort(int operation_request_id,
              const storage::AsyncFileUtil::StatusCallback& callback);
 
+  // Called when a directory becomes watched successfully.
+  void OnObserveDirectoryCompleted(
+      const base::FilePath& directory_path,
+      bool recursive,
+      const storage::AsyncFileUtil::StatusCallback& callback,
+      base::File::Error result);
+
   Profile* profile_;                       // Not owned.
   extensions::EventRouter* event_router_;  // Not owned. May be NULL.
   ProvidedFileSystemInfo file_system_info_;
   scoped_ptr<NotificationManagerInterface> notification_manager_;
   RequestManager request_manager_;
+  ObservedEntries observed_entries_;
+  ObserverList<Observer> observers_;
 
   base::WeakPtrFactory<ProvidedFileSystem> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ProvidedFileSystem);