Add AX role for blockquote tag

Source/core/accessibility/AXRenderObject.cpp

Index: Source/core/accessibility/AXRenderObject.cpp
diff --git a/Source/core/accessibility/AXRenderObject.cpp b/Source/core/accessibility/AXRenderObject.cpp
index 39bcf992bc8d194c679355cf346dd3016741916a..b06df9c833ee3dd237e9db8e12d370fd3be7ebc8 100644
--- a/Source/core/accessibility/AXRenderObject.cpp
+++ b/Source/core/accessibility/AXRenderObject.cpp
@@ -388,6 +388,9 @@ AccessibilityRole AXRenderObject::determineAccessibilityRole()
     if (node && node->hasTagName(articleTag))
         return ArticleRole;
 
+    if (node && node->hasTagName(blockquoteTag))
+        return BlockquoteRole;
+
     if (node && node->hasTagName(mainTag))
         return MainRole;
 
@@ -701,6 +704,9 @@ bool AXRenderObject::computeAccessibilityIsIgnored() const
     if (roleValue() == ListItemRole)
         return false;
 
+    if (roleValue() == BlockquoteRole)
+        return false;
+
     if (roleValue() == DialogRole)
         return false;