Adding mojo calls for easy unlock service

components/proximity_auth/screenlock_bridge.cc

Index: components/proximity_auth/screenlock_bridge.cc
diff --git a/components/proximity_auth/screenlock_bridge.cc b/components/proximity_auth/screenlock_bridge.cc
index 891c9d1675f9718cd3055d9fdf5ec53e087c3275..f0cc8c40324756eb8236308f34ef0fda7a15459c 100644
--- a/components/proximity_auth/screenlock_bridge.cc
+++ b/components/proximity_auth/screenlock_bridge.cc
@@ -67,8 +67,7 @@ ScreenlockBridge::UserPodCustomIconOptions::~UserPodCustomIconOptions() {
 std::unique_ptr<base::DictionaryValue>
 ScreenlockBridge::UserPodCustomIconOptions::ToDictionaryValue() const {
   auto result = base::MakeUnique<base::DictionaryValue>();
-  std::string icon_id = GetIdForIcon(icon_);
-  result->SetString("id", icon_id);
+  result->SetString("id", GetIDString());
 
   if (!tooltip_.empty()) {
     auto tooltip_options = base::MakeUnique<base::DictionaryValue>();
@@ -114,6 +113,10 @@ void ScreenlockBridge::UserPodCustomIconOptions::SetTrialRun() {
   is_trial_run_ = true;
 }
 
+std::string ScreenlockBridge::UserPodCustomIconOptions::GetIDString() const {
+  return GetIdForIcon(icon_);
+}
+
 // static
 ScreenlockBridge* ScreenlockBridge::Get() {
   return g_screenlock_bridge_instance.Pointer();