Make Smart Lock user pod icons work well with ChromeVox.

chrome/browser/signin/screenlock_bridge.cc

Index: chrome/browser/signin/screenlock_bridge.cc
diff --git a/chrome/browser/signin/screenlock_bridge.cc b/chrome/browser/signin/screenlock_bridge.cc
index a78d2613a24a3678d35844b720d93abde52179b1..5fb5192ab165302b64d49dc46808e1f4550ba2c0 100644
--- a/chrome/browser/signin/screenlock_bridge.cc
+++ b/chrome/browser/signin/screenlock_bridge.cc
@@ -74,6 +74,9 @@ ScreenlockBridge::UserPodCustomIconOptions::ToDictionaryValue() const {
     result->Set("tooltip", tooltip_options);
   }
 
+  if (!aria_label_.empty())
+    result->SetString("ariaLabel", aria_label_);
+
   if (hardlock_on_click_)
     result->SetBoolean("hardlockOnClick", true);
 
@@ -92,6 +95,11 @@ void ScreenlockBridge::UserPodCustomIconOptions::SetTooltip(
   autoshow_tooltip_ = autoshow;
 }
 
+void ScreenlockBridge::UserPodCustomIconOptions::SetAriaLabel(
+    const base::string16& aria_label) {
+  aria_label_ = aria_label;
+}
+
 void ScreenlockBridge::UserPodCustomIconOptions::SetHardlockOnClick() {
   hardlock_on_click_ = true;
 }