Refactor viewport initialization logic out of WebViewImpl.

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 751f3a98310b9822e7315a0f6c2bae80b671e243..e96db7a78e0cfcfb84c256c12a085477accce944 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -1339,6 +1339,16 @@ crbug.com/225184 inspector/elements/highlight-node-scaled.html [ Failure Timeout
 crbug.com/225184 svg/as-image/image-respects-pageScaleFactor.html [ Failure ImageOnlyFailure ]
 crbug.com/225184 fast/text/descent-clip-in-scaled-page.html [ ImageOnlyFailure ]
 
+# Viewport tag tests involving "height" parameter.
+crbug.com/242336 fast/viewport/viewport-2.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-31.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-32.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-40.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-41.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-48.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-53.html [ Failure ]
+crbug.com/242336 fast/viewport/viewport-117.html [ Failure ]
+
 # Pixel tests for RTL iframe scrollbar is erroneous. Cannot observe on actual browser.
 crbug.com/227473 [ Debug ] virtual/softwarecompositing/rtl/rtl-iframe-absolute-overflow-scrolled.html [ Pass Failure ]
 crbug.com/227473 [ Debug ] compositing/rtl/rtl-iframe-absolute-overflow-scrolled.html [ Pass Failure ]