Render Unicode control characters

third_party/WebKit/Source/platform/text/Character.h

Index: third_party/WebKit/Source/platform/text/Character.h
diff --git a/third_party/WebKit/Source/platform/text/Character.h b/third_party/WebKit/Source/platform/text/Character.h
index 8d3c4159b15027e2aac471c75acc0de070c0f1dd..1bef1a6713bfa6b0ebe72430d5ece69e1dd9587b 100644
--- a/third_party/WebKit/Source/platform/text/Character.h
+++ b/third_party/WebKit/Source/platform/text/Character.h
@@ -96,10 +96,16 @@ public:
             || c == zeroWidthNonJoinerCharacter
             || c == zeroWidthJoinerCharacter;
     }
-    static bool treatAsZeroWidthSpaceInComplexScript(UChar32 c)
+    static bool legacyTreatAsZeroWidthSpaceInComplexScript(UChar32 c)
     {
         return c < 0x20 // ASCII Control Characters
             || (c >= 0x7F && c < 0xA0) // ASCII Delete .. No-break spaceCharacter
+            || treatAsZeroWidthSpaceInComplexScript(c);
+    }
+    static bool treatAsZeroWidthSpaceInComplexScript(UChar32 c)
+    {
+        return c == formFeedCharacter
+            || c == carriageReturnCharacter
             || c == softHyphenCharacter
             || c == zeroWidthSpaceCharacter
             || (c >= leftToRightMarkCharacter && c <= rightToLeftMarkCharacter)