Support screen.lockOrientation() / screen.unlockOrientation() when running layout tests

content/test/layouttest_support.cc

Index: content/test/layouttest_support.cc
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index f8d9a3aaca804bf454805352b7afd6c73e9637d0..588d1de6106e36dbb430b7462aae103c5d504d5e 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -108,6 +108,11 @@ void SetMockScreenOrientation(
       SetMockScreenOrientationForTesting(orientation);
 }
 
+void ResetMockScreenOrientation()
+{
+  RendererWebKitPlatformSupportImpl::ResetMockScreenOrientationForTesting();
+}
+
 void EnableRendererLayoutTestMode() {
   RenderThreadImpl::current()->set_layout_test_mode(true);
 }