Fix race condition in parallel font initialization.

src/ports/SkFontConfigInterface_direct.cpp

Index: src/ports/SkFontConfigInterface_direct.cpp
diff --git a/src/ports/SkFontConfigInterface_direct.cpp b/src/ports/SkFontConfigInterface_direct.cpp
index dc9afbae1f47b642704ca02df68923145f38898f..c0cfd8fdcf9cd9c43ab565cb15e76d58badb9b6b 100644
--- a/src/ports/SkFontConfigInterface_direct.cpp
+++ b/src/ports/SkFontConfigInterface_direct.cpp
@@ -124,9 +124,13 @@ private:
     SkMutex mutex_;
 };
 
-SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface() {
-    SK_DECLARE_STATIC_LAZY_PTR(SkFontConfigInterfaceDirect, direct);
-    return direct.get();
+SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface(SkBaseMutex* mutex) {
+    SkAutoMutexAcquire ac(mutex);
+    static SkFontConfigInterfaceDirect* singleton = NULL;
+    if (singleton == NULL) {
+        singleton = SkNEW(SkFontConfigInterfaceDirect);
+    }
+    return singleton;
 }
 
 ///////////////////////////////////////////////////////////////////////////////