Adding learn more link in chrome://settings for a11y features

R=jhawkins@chromium.org
BUG=158290
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/11418231

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170407 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/chromeos_strings.grdp

@@ -706,6 +706,9 @@ Press any key to continue exploring.
   <message name="IDS_OPTIONS_SETTINGS_BLUETOOTH_FORGET_FAILED">
     Failed to disconnect and unpair from "<ph name="DEVICE_NAME">%1<ex>Nexus S</ex></ph>".
   </message>
+  <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_EXPLANATION" desc="In the settings tab, this text explains the accessibiliy features.">
+    Enable the accessibility features you need.
+  </message>
   <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_DESCRIPTION" desc="In the settings tab, the text next to the checkbox for spoken feedback.">
     Enable spoken feedback
   </message>

chrome/browser/resources/options/browser_options.html

@@ -600,6 +600,11 @@
   <section>
     <h3 i18n-content="accessibilityTitle"></h3>
     <div class="option-control-table">
+      <p id="accessibility-explanation" class="settings-row">
+        <span i18n-content="accessibilityExplanation"></span>
+        <a target="_blank" i18n-content="learnMore"
+            i18n-values="href:accessibilityLearnMoreURL"></a>
+      </p>
       <div class="option-name">
         <div class="checkbox">
           <label>

chrome/browser/ui/webui/options/browser_options_handler.cc

@@ -280,6 +280,8 @@ void BrowserOptionsHandler::GetLocalizedValues(DictionaryValue* values) {
     { "themesReset", IDS_THEMES_RESET_BUTTON },
 #endif
 #if defined(OS_CHROMEOS)
+    { "accessibilityExplanation",
+      IDS_OPTIONS_SETTINGS_ACCESSIBILITY_EXPLANATION },
     { "accessibilityHighContrast",
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_HIGH_CONTRAST_DESCRIPTION },
     { "accessibilityScreenMagnifier",
@@ -412,6 +414,9 @@ void BrowserOptionsHandler::GetLocalizedValues(DictionaryValue* values) {
   // TODO(pastarmovj): replace this with a call to the CrosSettings list
   // handling functionality to come.
   values->Set("timezoneList", GetTimezoneList().release());
+
+  values->SetString("accessibilityLearnMoreURL",
+                    chrome::kChromeAccessibilityHelpURL);
 #endif
 #if defined(OS_MACOSX)
   values->SetString("macPasswordsWarning",