Automatically trigger installation of high-quality speech synthesis extension.

chrome/common/extensions/extension_constants.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 235 matching lines @@
 #if defined(OS_CHROMEOS)
   // Path to preinstalled ChromeVox screen reader extension.
   extern const char kChromeVoxExtensionPath[];
   // Path to preinstalled Connectivity Diagnostics extension.
   extern const char kConnectivityDiagnosticsPath[];
   extern const char kConnectivityDiagnosticsLauncherPath[];
   // Path to preinstalled speech synthesis extension.
   extern const char kSpeechSynthesisExtensionPath[];
   // The extension id of the speech synthesis extension.
   extern const char kSpeechSynthesisExtensionId[];
+  // The extension id of the high quality speech synthesis extension for
+  // en-US, which can be installed automatically from the web store.
+  extern const char kHighQuality_en_US_ExtensionId[];
   // The extension id of the wallpaper manager application.
   extern const char kWallpaperManagerId[];
   // The extension id of the first run dialog application.
   extern const char kFirstRunDialogId[];
 #endif
 
   // What causes an extension to be installed? Used in histograms, so don't
   // change existing values.
   enum CrxInstallCause {
     INSTALL_CAUSE_UNSET = 0,
@@ skipping 37 matching lines @@
   // List of sizes for extension icons that can be defined in the manifest.
   extern const int kExtensionActionIconSizes[];
   extern const size_t kNumExtensionActionIconSizes;
 
   // List of sizes for extension icons that can be defined in the manifest.
   extern const int kScriptBadgeIconSizes[];
   extern const size_t kNumScriptBadgeIconSizes;
 }  // namespace extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_