Wired support for file truncating with RemoteFileSystemOperation::OpenFile() method (case when base…

chrome/browser/chromeos/gdata/gdata_file_system_proxy.h

Index: chrome/browser/chromeos/gdata/gdata_file_system_proxy.h
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.h b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.h
index 34036dff7971cd518e7734007a2790901dbc6299..3898a047be8af717201d6a88d2ecc5ca4cef859e 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.h
@@ -62,6 +62,10 @@ class GDataFileSystemProxy : public fileapi::RemoteFileSystemProxyInterface {
       base::ProcessHandle peer_handle,
       const fileapi::FileSystemOperationInterface::OpenFileCallback&
           callback) OVERRIDE;
+  virtual void NotifyFileClosed(
+      const GURL& path,
+      const fileapi::FileSystemOperationInterface::StatusCallback&
+          callback) OVERRIDE;
   // TODO(zelidrag): More methods to follow as we implement other parts of FSO.
 
  protected:
@@ -132,6 +136,25 @@ class GDataFileSystemProxy : public fileapi::RemoteFileSystemProxyInterface {
       const fileapi::FileSystemOperationInterface::StatusCallback& callback,
       base::PlatformFileError* truncate_result);
 
+  // Invoked during OpenFile() operation when truncate or write flags are set.
+  // This is called when a local modifiable cached file is ready for such
+  // operation.
+  void OnOpenFileForWriting(
+      int file_flags,
+      base::ProcessHandle peer_handle,
+      const fileapi::FileSystemOperationInterface::OpenFileCallback& callback,
+      base::PlatformFileError open_result,
+      const FilePath& local_cache_path);
+
+  // Invoked during OpenFile() operation when base::PLATFORM_FILE_OPEN_TRUNCATED
+  // flag is set. This is called when the truncation of a local cache file is
+  // finished on FILE thread.
+  void OnOpenAndTruncate(
+      base::ProcessHandle peer_handle,
+      const fileapi::FileSystemOperationInterface::OpenFileCallback& callback,
+      base::PlatformFile* platform_file,
+      base::PlatformFileError* truncate_result);
+
   // GDataFileSystemProxy is owned by Profile, which outlives
   // GDataFileSystemProxy, which is owned by CrosMountPointProvider (i.e. by
   // the time Profile is removed, the file manager is already gone). Hence