[PPAPI] Fixed FileSystems from JavaScript not having a context.

content/browser/renderer_host/pepper/pepper_file_system_browser_host.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_SYSTEM_BROWSER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_SYSTEM_BROWSER_HOST_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/host/host_message_context.h"
 #include "ppapi/host/resource_host.h"
 #include "url/gurl.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/common/fileapi/file_system_types.h"
 
 namespace content {
 
 class BrowserPpapiHost;
 
 class PepperFileSystemBrowserHost :
     public ppapi::host::ResourceHost,
     public base::SupportsWeakPtr<PepperFileSystemBrowserHost> {
  public:
   // Creates a new PepperFileSystemBrowserHost for a file system of a given
   // |type|. The host must be opened before use.
   PepperFileSystemBrowserHost(BrowserPpapiHost* host,
                               PP_Instance instance,
                               PP_Resource resource,
                               PP_FileSystemType type);
-  // Creates a new PepperFileSystemBrowserHost with an existing file system at
-  // the given |root_url| and of the given |type|. The file system at |root_url|
-  // must already be opened. Once created, the PepperFileSystemBrowserHost may
-  // be used without being opened.
-  PepperFileSystemBrowserHost(BrowserPpapiHost* host,
-                              PP_Instance instance,
-                              PP_Resource resource,
-                              const GURL& root_url,
-                              PP_FileSystemType type);
   virtual ~PepperFileSystemBrowserHost();
 
+  // Opens the PepperFileSystemBrowserHost to use an existing file system at the
+  // given |root_url|. The file system at |root_url| must already be opened and
+  // have the type given by GetType().
+  // Calls |callback| when complete.
+  void OpenExisting(const GURL& root_url, const base::Closure& callback);
+
   // ppapi::host::ResourceHost override.
   virtual int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) OVERRIDE;
   virtual bool IsFileSystemHost() OVERRIDE;
 
   // Supports FileRefs direct access on the host side.
   PP_FileSystemType GetType() const { return type_; }
   bool IsOpened() const { return opened_; }
   GURL GetRootUrl() const { return root_url_; }
   scoped_refptr<fileapi::FileSystemContext> GetFileSystemContext() const {
     return fs_context_;
   }
 
  private:
+  void OpenExistingWithContext(
+      const base::Closure& callback,
+      scoped_refptr<fileapi::FileSystemContext> fs_context);
   void GotFileSystemContext(
       ppapi::host::ReplyMessageContext reply_context,
       fileapi::FileSystemType file_system_type,
       scoped_refptr<fileapi::FileSystemContext> fs_context);
   void GotIsolatedFileSystemContext(
       ppapi::host::ReplyMessageContext reply_context,
       scoped_refptr<fileapi::FileSystemContext> fs_context);
   void OpenFileSystemComplete(
       ppapi::host::ReplyMessageContext reply_context,
       const GURL& root,
@@ skipping 15 matching lines @@
   bool called_open_;  // whether open has been called.
 
   base::WeakPtrFactory<PepperFileSystemBrowserHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperFileSystemBrowserHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_SYSTEM_BROWSER_HOST_H_