Fewer reused duplicate symbol names in animation.

third_party/WebKit/Source/core/animation/FontWeightConversion.h

Index: third_party/WebKit/Source/core/animation/FontWeightConversion.h
diff --git a/third_party/WebKit/Source/core/animation/FontWeightConversion.h b/third_party/WebKit/Source/core/animation/FontWeightConversion.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9bcd41ce6f740cfa31d77b7dbd198bd4494bbde
--- /dev/null
+++ b/third_party/WebKit/Source/core/animation/FontWeightConversion.h
@@ -0,0 +1,17 @@
+// Copyright 2017 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 FontWeightConversion_h
+#define FontWeightConversion_h
+
+#include "platform/fonts/FontTraits.h"
+
+namespace blink {
+
+double fontWeightToDouble(FontWeight);
+FontWeight doubleToFontWeight(double value);
+
+}  // namespace blink
+
+#endif  // FontWeightConversion_h