Add LocalFileSyncContext class which wires up profile-owned service and FileSystemContext(s)

webkit/fileapi/syncable/canned_syncable_file_system.h

Index: webkit/fileapi/syncable/canned_syncable_file_system.h
diff --git a/webkit/fileapi/syncable/canned_syncable_file_system.h b/webkit/fileapi/syncable/canned_syncable_file_system.h
index 10dd4468c0b9019323f98da6e33e077ec5da6d73..9bc421680887da932ca0b27b78fce235b422cf41 100644
--- a/webkit/fileapi/syncable/canned_syncable_file_system.h
+++ b/webkit/fileapi/syncable/canned_syncable_file_system.h
@@ -61,6 +61,7 @@ class FILEAPI_EXPORT CannedSyncableFileSystem {
   }
 
   // Helper routines to perform file system operations.
+  // OpenFileSystem() must have been called before calling any of them.
   // (They run on the current thread and returns synchronously).
   base::PlatformFileError CreateDirectory(const FileSystemURL& url);
   base::PlatformFileError CreateFile(const FileSystemURL& url);
@@ -89,6 +90,10 @@ class FILEAPI_EXPORT CannedSyncableFileSystem {
   base::PlatformFileError result_;
   SyncStatusCode sync_status_;
 
+  // Boolean flags mainly for helping debug.
+  bool is_filesystem_set_up_;
+  bool is_filesystem_opened_;
+
   base::WeakPtrFactory<CannedSyncableFileSystem> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedSyncableFileSystem);