Enable runtime switching between ChromeVox and ChromeVox next via command line.

chrome/browser/extensions/component_loader.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/component_loader.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 322 matching lines @@
   Add(IDR_NETWORK_SPEECH_SYNTHESIS_MANIFEST,
       base::FilePath(FILE_PATH_LITERAL("network_speech_synthesis")));
 }
 
 #if defined(OS_CHROMEOS)
 void ComponentLoader::AddChromeVoxExtension(
     const base::Closure& done_cb) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   base::FilePath resources_path;
   PathService::Get(chrome::DIR_RESOURCES, &resources_path);
+
   base::FilePath chromevox_path =
       resources_path.Append(extension_misc::kChromeVoxExtensionPath);
 
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
-  const char* manifest_filename =
-      command_line->HasSwitch(chromeos::switches::kGuestSession) ?
-      extension_misc::kChromeVoxGuestManifestFilename :
-          extension_misc::kChromeVoxManifestFilename;
+  bool is_chromevox_next =
+      command_line->HasSwitch(chromeos::switches::kEnableChromeVoxNext);
+  bool is_guest = command_line->HasSwitch(chromeos::switches::kGuestSession);
+  const char* manifest_filename;
+  if (is_chromevox_next) {
+    manifest_filename =
+        is_guest ? extension_misc::kChromeVoxNextGuestManifestFilename
+                 : extension_misc::kChromeVoxNextManifestFilename;
+  } else {
+    manifest_filename =
+        is_guest ? extension_misc::kChromeVoxGuestManifestFilename
+                 : extension_misc::kChromeVoxManifestFilename;
+  }
   BrowserThread::PostTaskAndReplyWithResult(
       BrowserThread::FILE,
       FROM_HERE,
       base::Bind(&LoadManifestOnFileThread, chromevox_path, manifest_filename),
       base::Bind(&ComponentLoader::AddChromeVoxExtensionWithManifest,
                  weak_factory_.GetWeakPtr(),
                  chromevox_path,
                  done_cb));
 }
 
@@ skipping 279 matching lines @@
         off_the_record_context, Extension::GetBaseURLFromExtensionId(id));
     storage::FileSystemContext* file_system_context =
         content::BrowserContext::GetStoragePartitionForSite(
             off_the_record_context, site)->GetFileSystemContext();
     file_system_context->EnableTemporaryFileSystemInIncognito();
   }
 #endif
 }
 
 }  // namespace extensions