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..3eb1e42cc9e616f249491be3e0cfa61416b10c5e 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_originalComputedAccessibilityInfoEnabled;
     };
 
     static PassRefPtrWillBeRawPtr<InternalSettings> create(Page& page)
@@ -121,6 +122,7 @@ public:
     void setLaxMixedContentCheckingEnabled(bool);
     void setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(bool);
     void setImageColorProfilesEnabled(bool);
+    void setComputedAccessibilityInfoEnabled(bool);
 
     virtual void trace(Visitor*) override;