Componentization: fix SupplementTracing<0>::~SupplementTracing<0>(void) already defined.

Source/core/page/PageSupplementable.h

Index: Source/core/page/PageSupplementable.h
diff --git a/Source/core/page/PageSupplementable.h b/Source/core/page/PageSupplementable.h
new file mode 100644
index 0000000000000000000000000000000000000000..abe36280df9e487c30323cde017f969a2c1d21b7
--- /dev/null
+++ b/Source/core/page/PageSupplementable.h
@@ -0,0 +1,20 @@
+// Copyright 2015 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 PageSupplementable_h
+#define PageSupplementable_h
+
+#include "core/CoreExport.h"
+#include "platform/Supplementable.h"
+
+namespace blink {
+
+class Page;
+
+extern template class CORE_TEMPLATE_EXPORT HeapSupplement<Page>;
+extern template class CORE_TEMPLATE_EXPORT Supplement<Page>;

[haraken, 2015/04/22 05:26:53]

extern template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;

[haraken, 2015/04/22 05:26:53]

BTW, can we add this extern declaration to Page.h, instead of adding a new file?

[tasak, 2015/04/22 06:59:37]

Done.

[tasak, 2015/04/22 06:59:37]

Done.

+
+} // namespace blink
+
+#endif // PageSupplementable_h