Use css-device-adapt constraining for legacy viewport tags.

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index bb65f9db502346501c58ec954bf6b38d90d38bba..6dda59647d1c88014389714acbbf063e1d5ac777 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -265,9 +265,11 @@ public:
     // FIXME: StyleResolver should not have this member or method.
     InspectorCSSOMWrappers& inspectorCSSOMWrappers() { return m_inspectorCSSOMWrappers; }
 
+    enum ViewportOrigin { ViewportUserAgent, ViewportAuthor };

[kenneth.r.christiansen, 2013/09/02 11:55:28]

Wouldn't UserAgentOrigin, AuthorOrigin not make more sense?

like what is a viewport user agent?

[rune, 2013/09/03 08:27:10]

Done.

+
     // Exposed for ScopedStyleResolver.
     // FIXME: Likely belongs on viewportStyleResolver.

[rune, 2013/09/02 11:53:39]

Feels even more like it now. Should I move it as part of this CL?

-    void collectViewportRules(RuleSet*);
+    void collectViewportRules(RuleSet*, ViewportOrigin);
 
     const RuleFeatureSet& ruleFeatureSet() const { return m_features; }