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

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h

Index: chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
diff --git a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
index 3085ecc6b86e62ac78760f222a0edaf9b796c2e4..bab24ae28cdbddd103d6c43b793f028d729ab6b8 100644
--- a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
+++ b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
@@ -40,6 +40,16 @@ class FileSystemProviderGetAllFunction : public ChromeSyncExtensionFunction {
   virtual bool RunSync() OVERRIDE;
 };
 
+class FileSystemProviderNotifyFunction : public ChromeSyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("fileSystemProvider.notify",
+                             FILESYSTEMPROVIDER_NOTIFY)
+
+ protected:
+  virtual ~FileSystemProviderNotifyFunction() {}
+  virtual bool RunSync() OVERRIDE;
+};
+
 class FileSystemProviderInternalUnmountRequestedSuccessFunction
     : public FileSystemProviderInternalFunction {
  public: