Remove 'Enable tap-to-click' checkbox for non-touchpad devices.

chrome/browser/ui/webui/options/chromeos/system_options_handler.cc

 // Copyright (c) 2011 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/ui/webui/options/chromeos/system_options_handler.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_value_serializer.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/accessibility_util.h"
 #include "chrome/browser/chromeos/language_preferences.h"
+#include "chrome/browser/chromeos/system/touchpad_settings.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/options/chromeos/system_settings_provider.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/extensions/extension.h"
 #include "grit/browser_resources.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
@@ skipping 79 matching lines @@
       "options.SystemOptions.SetAccessibilityCheckboxState", checked);
 
   // Bluetooth support is a work in progress.  Supress the feature unless
   // explicitly enabled via a command line flag.
   // TODO (kevers) - Test for presence of bluetooth hardware.
   if (CommandLine::ForCurrentProcess()
       ->HasSwitch(switches::kEnableBluetooth)) {
     web_ui_->CallJavascriptFunction(
         "options.SystemOptions.showBluetoothSettings");
   }
+
+  if (!chromeos::system::touchpad_settings::TouchpadExists())
+    web_ui_->CallJavascriptFunction(
+        "options.SystemOptions.hideTapToClick");
 }
 
 void SystemOptionsHandler::RegisterMessages() {
   DCHECK(web_ui_);
   web_ui_->RegisterMessageCallback("accessibilityChange",
       base::Bind(&SystemOptionsHandler::AccessibilityChangeCallback,
                  base::Unretained(this)));
   web_ui_->RegisterMessageCallback("bluetoothEnableChange",
       NewCallback(this, &SystemOptionsHandler::BluetoothEnableChangeCallback));
   web_ui_->RegisterMessageCallback("findBluetoothDevices",
@@ skipping 43 matching lines @@
     device.SetString("deviceName", data[3*i]);
     device.SetString("deviceId", data[3*i+1]);
     device.SetString("deviceType", data[3*i+2]);
     device.SetString("deviceStatus", "bluetoothDeviceNotPaired");
     web_ui_->CallJavascriptFunction(
         "options.SystemOptions.addBluetoothDevice", device);
   }
   web_ui_->CallJavascriptFunction(
       "options.SystemOptions.notifyBluetoothSearchComplete");
 }