Allow multiple calls to SetDefaultSkiaFactory on Windows.

skia/ext/fontmgr_default_win.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "skia/ext/fontmgr_default_win.h"
 
 #include "third_party/skia/include/ports/SkFontMgr.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
 
 namespace {
 
 // This is a leaky bare owning pointer.
 SkFontMgr* g_default_fontmgr;
 
+// The ppapi code currently calls SetDefaultSkiaFactory twice on Win8+.
+// This tracks when the global escapes and shouldno longer be set.
+SkDEBUGCODE(bool g_factory_called;)
+
 }  // namespace
 
 void SetDefaultSkiaFactory(sk_sp<SkFontMgr> fontmgr) {
-  SkASSERT(g_default_fontmgr == nullptr);
+  SkASSERT(!g_factory_called);
+
+  SkSafeUnref(g_default_fontmgr);
   g_default_fontmgr = fontmgr.release();
 }
 
 SK_API sk_sp<SkFontMgr> SkFontMgr::Factory() {
+  SkDEBUGCODE(g_factory_called = true;)
+
   // This will be set when DirectWrite is in use, and an SkFontMgr has been
   // created with the pre-sandbox warmed up one. Otherwise, we fallback to a
   // GDI SkFontMgr which is used in the browser.
   if (g_default_fontmgr)
     return sk_ref_sp(g_default_fontmgr);
   return SkFontMgr_New_GDI();
 }