Add CreateFileSystemOperation() method to FileSystemContext

webkit/fileapi/file_system_operation.h

Index: webkit/fileapi/file_system_operation.h
diff --git a/webkit/fileapi/file_system_operation.h b/webkit/fileapi/file_system_operation.h
index ac9b3e5bb5171cd9c7d76184df1aec2ef695a249..55687d4e4784f600aa011f9c965cde2c597bca6e 100644
--- a/webkit/fileapi/file_system_operation.h
+++ b/webkit/fileapi/file_system_operation.h
@@ -44,10 +44,6 @@ class FileSystemOperationTest;
 // FileSystemOperation implementation for local file systems.
 class FileSystemOperation : public FileSystemOperationInterface {
  public:
-  // |dispatcher| will be owned by this class.
-  FileSystemOperation(FileSystemCallbackDispatcher* dispatcher,
-                      scoped_refptr<base::MessageLoopProxy> proxy,
-                      FileSystemContext* file_system_context);
   virtual ~FileSystemOperation();
 
   // FileSystemOperation overrides.
@@ -85,6 +81,17 @@ class FileSystemOperation : public FileSystemOperationInterface {
  private:
   class ScopedQuotaUtilHelper;
 
+  // Only MountPointProviders or testing class can create a
+  // new operation directly.
+  friend class SandboxMountPointProvider;
+  friend class CrosMountPointProvider;
+  friend class FileSystemTestHelper;
+
+  // |dispatcher| will be owned by this class.
+  FileSystemOperation(FileSystemCallbackDispatcher* dispatcher,
+                      scoped_refptr<base::MessageLoopProxy> proxy,
+                      FileSystemContext* file_system_context);
+
   FileSystemContext* file_system_context() const {
     return operation_context_.file_system_context();
   }