Implement computedRole and computedName (behind a flag)

Source/core/testing/InternalSettings.h

Index: Source/core/testing/InternalSettings.h
diff --git a/Source/core/testing/InternalSettings.h b/Source/core/testing/InternalSettings.h
index 616e615423da05bcb95e22e6fc8c0100e696c62f..7c065b096987d4980c55164ed9af3225e333f0f1 100644
--- a/Source/core/testing/InternalSettings.h
+++ b/Source/core/testing/InternalSettings.h
@@ -73,6 +73,7 @@ public:
         bool m_originalLayerSquashingEnabled;
         bool m_originalPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled;
         bool m_originalImageColorProfilesEnabled;
+        bool m_originalExperimentalAccessibilityFeaturesEnabled;

[adamk, 2014/12/16 01:54:49]

Do you need this bit? I thought experimental features were on-by-default in
Layout Tests...

[aboxhall, 2014/12/16 04:15:26]

Do you mean I should revert everything in core/testing ?

[adamk, 2014/12/16 18:25:14]

Yes, sorry, that's what I meant to say. I think you'd only need it here if you
wanted to be able to turn it on and off from inside a layout test.

     };
 
     static PassRefPtrWillBeRawPtr<InternalSettings> create(Page& page)
@@ -121,6 +122,7 @@ public:
     void setLaxMixedContentCheckingEnabled(bool);
     void setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(bool);
     void setImageColorProfilesEnabled(bool);
+    void setExperimentalAccessibilityFeaturesEnabled(bool);
 
     virtual void trace(Visitor*) override;