Make ScriptCustomeElementDefinition class to hold ScriptState
This patch introduces |m_scriptState| member variable to
|ScriptCustomeElementDefinition| class to hold |ScriptState| pointer, to
return |ScriptValue| for JavaScript's constructor, prototype, callbacks,
etc, on the context where JavaScript values created.
This patch is a preparation of crrev.com/1994093002, introduce
|CustomElementRegistry#get()| method.
BUG=594918
TEST=n/a; no behavior changes
Review-Url: https://codereview.chromium.org/2030443003
Cr-Commit-Position: refs/heads/master@{#397069}
3 files changed
