Collect @viewport before constructing RuleSets.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 1a99401fc2b06c315df222627dcd2e2638ddd12a..109106484c27697a26b82514d9de111443151a5a 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -433,6 +433,7 @@ void FrameView::setFrameRect(const IntRect& newRect) {
 
     if (m_frame->isMainFrame())
       m_frame->host()->visualViewport().mainFrameDidChangeSize();
+
     frame().loader().restoreScrollPositionAndViewState();
   }
 }
@@ -4485,11 +4486,8 @@ void FrameView::setInitialViewportSize(const IntSize& viewportSize) {
     return;
 
   m_initialViewportSize = viewportSize;
-  // TODO(rune@opera.com): Notify the viewport style resolver about the changed
-  // initial viewport:
-  //
-  // if (Document* document = m_frame->document())
-  //   document->styleEngine().initialViewportChanged();
+  if (Document* document = m_frame->document())
+    document->styleEngine().initialViewportChanged();
 }
 
 int FrameView::initialViewportWidth() const {