Add a context field to the accessibility extension API.

chrome/browser/chromeos/login/wizard_accessibility_handler_unittest.cc

Index: chrome/browser/chromeos/login/wizard_accessibility_handler_unittest.cc
===================================================================
--- chrome/browser/chromeos/login/wizard_accessibility_handler_unittest.cc	(revision 114416)
+++ chrome/browser/chromeos/login/wizard_accessibility_handler_unittest.cc	(working copy)
@@ -44,7 +44,7 @@
 
   // Test a simple control.
   std::string button_name = "Save";
-  AccessibilityButtonInfo button_info(NULL, button_name);
+  AccessibilityButtonInfo button_info(NULL, button_name, "");
   handler.DescribeAccessibilityEvent(
       chrome::NOTIFICATION_ACCESSIBILITY_CONTROL_FOCUSED,
       &button_info,
@@ -55,7 +55,7 @@
 
   // Test a control with multiple states.
   std::string checkbox_name = "Accessibility";
-  AccessibilityCheckboxInfo checkbox_info(NULL, checkbox_name, false);
+  AccessibilityCheckboxInfo checkbox_info(NULL, checkbox_name, "", false);
   handler.DescribeAccessibilityEvent(
       chrome::NOTIFICATION_ACCESSIBILITY_CONTROL_FOCUSED,
       &checkbox_info,
@@ -76,7 +76,7 @@
   std::string combobox_name = "Language";
   std::string combobox_value = "English";
   AccessibilityComboBoxInfo combobox_info(
-      NULL, combobox_name, combobox_value, 12, 35);
+      NULL, combobox_name, "", combobox_value, 12, 35);
   handler.DescribeAccessibilityEvent(
       chrome::NOTIFICATION_ACCESSIBILITY_CONTROL_FOCUSED,
       &combobox_info,
@@ -92,7 +92,7 @@
   std::string description;
   EarconType earcon;
 
-  AccessibilityTextBoxInfo textbox_info(NULL, "", false);
+  AccessibilityTextBoxInfo textbox_info(NULL, "", "", false);
   handler.DescribeAccessibilityEvent(
       chrome::NOTIFICATION_ACCESSIBILITY_CONTROL_FOCUSED,
       &textbox_info,