[Android] Stop using skia globals for font overriding in layout tests.

skia/ext/fontmgr_default_android.h

Index: skia/ext/fontmgr_default_android.h
diff --git a/skia/ext/fontmgr_default_android.h b/skia/ext/fontmgr_default_android.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7740508310aa7eeb442831817fe963afe126eb5
--- /dev/null
+++ b/skia/ext/fontmgr_default_android.h
@@ -0,0 +1,14 @@
+// Copyright 2016 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.
+
+#ifndef SKIA_EXT_FONTMGR_DEFAULT_ANDROID_H_
+#define SKIA_EXT_FONTMGR_DEFAULT_ANDROID_H_
+
+#include "third_party/skia/include/core/SkTypes.h"
+
+class SkFontMgr;
+
+SK_API void SetDefaultSkiaFactory(SkFontMgr* fontmgr);
+
+#endif  // SKIA_EXT_FONTMGR_DEFAULT_ANDROID_H_