Use WebScreenInfo members to provide screen orientation information for layout test support.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 86c8a12152edf6c1f6783b3a00031462c5f9a22d..3097cd07b6112e25aabd1ae6d9e1b1ee848f2467 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -360,6 +360,10 @@ class CONTENT_EXPORT RenderViewImpl
   // Change the device scale factor and force the compositor to resize.
   void SetDeviceScaleFactorForTesting(float factor);
 
+  // Change screen orientation and force the compositor to resize.
+  void SetScreenOrientationForTesting(
+      const blink::WebScreenOrientationType& orientation);
+
   // Change the device ICC color profile while running a layout test.
   void SetDeviceColorProfileForTesting(const std::vector<char>& color_profile);