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

chrome/browser/chromeos/file_system_provider/provided_file_system_observer.cc

Index: chrome/browser/chromeos/file_system_provider/provided_file_system_observer.cc
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.cc b/chrome/browser/chromeos/file_system_provider/provided_file_system_observer.cc
similarity index 68%
copy from chrome/browser/chromeos/file_system_provider/provided_file_system_interface.cc
copy to chrome/browser/chromeos/file_system_provider/provided_file_system_observer.cc
index 8b09fbe3769dc4dc20965016fdad5be781b29a86..1c6323c1c7729a24e651ab32309c2b758fe69679 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system_interface.cc
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system_observer.cc
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
 
 namespace chromeos {
 namespace file_system_provider {
 
-EntryMetadata::EntryMetadata() : is_directory(false), size(0) {
+ProvidedFileSystemObserver::ChildChange::ChildChange() : change_type(CHANGED) {
 }
 
-EntryMetadata::~EntryMetadata() {
+ProvidedFileSystemObserver::ChildChange::~ChildChange() {
 }
 
 }  // namespace file_system_provider