Make isolated file system works for a device root (e.g. X:\\)

chrome/browser/extensions/platform_app_launcher.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/platform_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 150 matching lines @@
         content::ChildProcessSecurityPolicy::GetInstance();
     int renderer_id = host->render_process_host()->GetID();
 
     // Granting read file permission to allow reading file content.
     // If the renderer already has permission to read these paths, it is not
     // regranted, as this would overwrite any other permissions which the
     // renderer may already have.
     if (!policy->CanReadFile(renderer_id, file_path))
       policy->GrantReadFile(renderer_id, file_path);
 
-    std::set<FilePath> filesets;
-    filesets.insert(file_path);
-
+    std::string registered_name;
     fileapi::IsolatedContext* isolated_context =
         fileapi::IsolatedContext::GetInstance();
     DCHECK(isolated_context);
-    std::string filesystem_id = isolated_context->RegisterIsolatedFileSystem(
-        filesets);
+    std::string filesystem_id = isolated_context->RegisterFileSystemForFile(
+        file_path, &registered_name);
     // Granting read file system permission as well to allow file-system
     // read operations.
     policy->GrantReadFileSystem(renderer_id, filesystem_id);
 
     extensions::AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
         profile_, extension_, ASCIIToUTF16(kViewIntent), filesystem_id,
-        file_path.BaseName());
+        registered_name);
   }
 
   // The profile the app should be run in.
   Profile* profile_;
   // The extension providing the app.
   const Extension* extension_;
   // The command line to be passed through to the app, or NULL.
   const CommandLine* command_line_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformAppCommandLineLauncher);
@@ skipping 101 matching lines @@
         new PlatformAppBlobIntentLauncher(profile, extension, web_intent_data);
     launcher->Launch();
     return;
   }
 
   extensions::AppEventRouter::DispatchOnLaunchedEventWithWebIntent(
       profile, extension, web_intent_data);
 }
 
 }  // namespace extensions