Add a helper class that keeps per-profile information for FileSystem API

chrome/browser/profile.h

Index: chrome/browser/profile.h
diff --git a/chrome/browser/profile.h b/chrome/browser/profile.h
index 9d3034c9326b7f42d03174d47b35d9438fe29cb3..3e21aadcc582cfa0abb5b03fc843d88e205a81db 100644
--- a/chrome/browser/profile.h
+++ b/chrome/browser/profile.h
@@ -50,6 +50,7 @@ class ExtensionMessageService;
 class ExtensionsService;
 class FaviconService;
 class FilePath;
+class FileSystemHostContext;
 class FindBarState;
 class GeolocationContentSettingsMap;
 class GeolocationPermissionContext;
@@ -276,6 +277,9 @@ class Profile {
   // Returns the PersonalDataManager associated with this profile.
   virtual PersonalDataManager* GetPersonalDataManager() = 0;
 
+  // Returns the HTML5 FileSystemHostContext assigned to this profile.
+  virtual FileSystemHostContext* GetFileSystemHostContext() = 0;
+
   // Init our themes system.
   virtual void InitThemes() = 0;