Fix race condition in parallel font initialization.

src/ports/SkFontConfigInterface_android.cpp

Index: src/ports/SkFontConfigInterface_android.cpp
diff --git a/src/ports/SkFontConfigInterface_android.cpp b/src/ports/SkFontConfigInterface_android.cpp
index 20e6c5eb84b6270b4b93b9979985e575d27f848c..1f901b9fa9f7457e876c12039656d950551a8153 100644
--- a/src/ports/SkFontConfigInterface_android.cpp
+++ b/src/ports/SkFontConfigInterface_android.cpp
@@ -155,7 +155,8 @@ static SkFontConfigInterfaceAndroid* getSingletonInterface() {
     return gFontConfigInterface;
 }
 
-SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface() {
+SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface(SkBaseMutex*) {
+    // Doesn't need passed-in mutex because getSingletonInterface() uses one
     return getSingletonInterface();
 }