[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
index 35ab44b87efaeb1bb245a58adf4f34fa59e12890..9bc94f1beb8c1ce4274df7a208ab5abb7acc3968 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
@@ -1524,6 +1524,11 @@ void StyleResolver::computeFont(ComputedStyle* style, const StylePropertySet& pr
     }
 }
 
+ViewportStyleResolver* StyleResolver::viewportStyleResolver() const
+{
+    return m_viewportStyleResolver.get();
+}
+
 void StyleResolver::addMediaQueryResults(const MediaQueryResultList& list)
 {
     for (size_t i = 0; i < list.size(); ++i)