Move CSSPropertyID templates instantiations to a separate file.

third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h

Index: third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
diff --git a/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h b/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d984e1d016c4553af8784c57e4d3a6639c69f2f
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
@@ -0,0 +1,23 @@
+// 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 CSSPropertyIDTemplates_h
+#define CSSPropertyIDTemplates_h
+
+#include "core/CSSPropertyNames.h"
+#include "wtf/HashFunctions.h"
+#include "wtf/HashTraits.h"
+
+namespace WTF {
+template<> struct DefaultHash<blink::CSSPropertyID> {
+    typedef IntHash<unsigned> Hash;
+};
+template<> struct HashTraits<blink::CSSPropertyID> : GenericHashTraits<blink::CSSPropertyID> {
+    static const bool emptyValueIsZero = true;
+    static void constructDeletedValue(blink::CSSPropertyID& slot, bool) { slot = static_cast<blink::CSSPropertyID>(blink::lastUnresolvedCSSProperty + 1); }
+    static bool isDeletedValue(blink::CSSPropertyID value) { return value == (blink::lastUnresolvedCSSProperty + 1); }
+};
+} // namespace WTF
+
+#endif // CSSPropertyIDTemplates_h