Adding support to retrieve remaining and total space on disk/file shelf.

chrome/browser/extensions/extension_file_browser_private_api.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_BROWSER_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_BROWSER_PRIVATE_API_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 278 matching lines @@
   virtual bool RunImpl() OVERRIDE;
 
 // FileBrowserFunction overrides.
   virtual void GetLocalPathsResponseOnUIThread(const FilePathList& files,
                                                void* context) OVERRIDE;
 
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("fileBrowserPrivate.formatDevice");
 };
 
+class GetSizeStatsFunction
+    :
+#ifdef OS_CHROMEOS
+      public chromeos::MountLibrary::CallbackDelegate,
+#endif
+      public FileBrowserFunction {
+ public:
+  GetSizeStatsFunction();
+
+#ifdef OS_CHROMEOS
+  // chromeos::MountLibrary::CallbackDelegate implementation.
+  void GetSizeStatsCallback(const char* mount_path,
+                            bool success,
+                            size_t total_size_kb,
+                            size_t remaining_size_kb) OVERRIDE;
+#endif
+
+ protected:
+  virtual ~GetSizeStatsFunction();
+
+  // FileBrowserFunction overrides.
+  virtual bool RunImpl() OVERRIDE;
+  virtual void GetLocalPathsResponseOnUIThread(const FilePathList& files,
+                                               void* context) OVERRIDE;
+
+ private:
+  DECLARE_EXTENSION_FUNCTION_NAME("fileBrowserPrivate.getSizeStats");
+};
+
 // Retrieves devices meta-data. Expects volume's device path as an argument.
 class GetVolumeMetadataFunction
     : public SyncExtensionFunction {
  public:
   GetVolumeMetadataFunction();
 
  protected:
   virtual ~GetVolumeMetadataFunction();
 
   virtual bool RunImpl() OVERRIDE;
@@ skipping 15 matching lines @@
   virtual ~FileDialogStringsFunction() {}
 
   // SyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("fileBrowserPrivate.getStrings");
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_BROWSER_PRIVATE_API_H_