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

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

Index: chrome/browser/ui/webui/options/handler_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/handler_options_handler.cc b/chrome/browser/ui/webui/options/handler_options_handler.cc
index bb76b44465868ca22f1945acc91a150ee5ce412c..4c8dfc7c6dbaded94678bd8580e7d2d34468ede5 100644
--- a/chrome/browser/ui/webui/options/handler_options_handler.cc
+++ b/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() {