options: add a learn more link to "Handlers" content settings dialog.

R=markusheintz@chromium.org
BUG=356741

Review URL: https://codereview.chromium.org/215273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260325 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/options/handler_options.html

@@ -29,10 +29,16 @@
     </div>
   </div>
   <div class="action-area">
-    <div class="button-strip">
-      <button id="handler-options-overlay-confirm" class="default-button"
-          i18n-content="done">
-      </button>
+    <div class="hbox stretch">
+      <a target="_blank" i18n-content="learnMore"
+          i18n-values="href:handlers_learn_more_url"></a>
+    </div>
+    <div class="action-area-right">
+      <div class="button-strip">
+        <button id="handler-options-overlay-confirm" class="default-button"
+            i18n-content="done">
+        </button>
+      </div>
     </div>
   </div>
 </div>

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

@@ -13,6 +13,7 @@
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry_factory.h"
+#include "chrome/browser/google/google_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/web_ui.h"
 #include "grit/generated_resources.h"
@@ -20,6 +21,13 @@
 
 namespace options {
 
+namespace {
+
+const char kHandlersLearnMoreUrl[] =
+    "https://support.google.com/chromebook/answer/1382847";
+
+}  // namespace
+
 HandlerOptionsHandler::HandlerOptionsHandler() {
 }
 
@@ -44,6 +52,10 @@ void HandlerOptionsHandler::GetLocalizedValues(
   RegisterTitle(localized_strings, "handlersPage",
                 IDS_HANDLER_OPTIONS_WINDOW_TITLE);
   RegisterStrings(localized_strings, resources, arraysize(resources));
+
+  localized_strings->SetString(
+      "handlers_learn_more_url",
+      google_util::StringAppendGoogleLocaleParam(kHandlersLearnMoreUrl));
 }
 
 void HandlerOptionsHandler::InitializeHandler() {