FilePathWatcher::Watch() - Listen for sub directory changes.

base/files/file_path_watcher.h

Index: base/files/file_path_watcher.h
diff --git a/base/files/file_path_watcher.h b/base/files/file_path_watcher.h
index 367be9435e9c952b7865b8f0aab3f479eeb6963e..651dada0972bea0e65e4e671400eb5e652f7b93f 100644
--- a/base/files/file_path_watcher.h
+++ b/base/files/file_path_watcher.h
@@ -59,6 +59,7 @@ class BASE_EXPORT FilePathWatcher {
 
     // Start watching for the given |path| and notify |delegate| about changes.
     virtual bool Watch(const FilePath& path,
+                       bool recursive,
                        Delegate* delegate) WARN_UNUSED_RESULT = 0;
 
     // Stop watching. This is called from FilePathWatcher's dtor in order to
@@ -115,13 +116,14 @@ class BASE_EXPORT FilePathWatcher {
   // Deprecated: new code should use the callback interface, declared below.
   // The FilePathWatcher::Delegate interface will be removed once all client
   // code has been updated. http://crbug.com/130980
-  virtual bool Watch(const FilePath& path, Delegate* delegate)
+  virtual bool Watch(const FilePath& path, bool recursive, Delegate* delegate)

[Mattias Nissler (ping if slow), 2012/11/21 09:28:48]

Don't add recursive here, this is the deprecated interface that new code should
not use.

[kmadhusu, 2012/11/22 01:39:41]

Done. Modified new code to call the impl_->Watch() directly.

       WARN_UNUSED_RESULT;
 
   // Invokes |callback| whenever updates to |path| are detected. This should be
-  // called at most once, and from a MessageLoop of TYPE_IO. The callback will
-  // be invoked on the same loop. Returns true on success.
-  bool Watch(const FilePath& path, const Callback& callback);
+  // called at most once, and from a MessageLoop of TYPE_IO. Set |recursive| to
+  // true, to watch |path| and its children. The callback will be invoked on
+  // the same loop. Returns true on success.

[Mattias Nissler (ping if slow), 2012/11/21 09:28:48]

Please put a note saying that recursive watches are not supported on all
platforms and will CHECK on platforms that don't support it.

[kmadhusu, 2012/11/22 01:39:41]

Done.

+  bool Watch(const FilePath& path, bool recursive, const Callback& callback);
 
  private:
   scoped_refptr<PlatformDelegate> impl_;