Merge "Add unicode flag to blink::ScriptRegexp, and measure incompatibility for |pattern| content a…

third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp

Index: third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp
diff --git a/third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp b/third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp
index 8d7065a1828a66d6760751251aac21157108b448..4cf599322bd59de5e26e42074709b8f8560eb99c 100644
--- a/third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp
+++ b/third_party/WebKit/Source/core/html/forms/BaseTextInputType.cpp
@@ -75,13 +75,26 @@ bool BaseTextInputType::patternMismatch(const String& value) const
 {
     const AtomicString& rawPattern = element().fastGetAttribute(patternAttr);
     // Empty values can't be mismatched
-    if (rawPattern.isNull() || value.isEmpty() || !ScriptRegexp(rawPattern, TextCaseSensitive).isValid())
+    if (rawPattern.isNull() || value.isEmpty())
         return false;
+    bool rawPatternIsValid = ScriptRegexp(rawPattern, TextCaseSensitive).isValid();
+    bool rawUnicodePatternIsValid = ScriptRegexp(rawPattern, TextCaseSensitive, MultilineDisabled, ScriptRegexp::UTF16).isValid();
+    if (rawPatternIsValid != rawUnicodePatternIsValid)
+        UseCounter::count(element().document(), UseCounter::PatternAttributeUnicodeFlagIsIncompatible);
+    if (!rawPatternIsValid)
+        return false;
+
     String pattern = "^(?:" + rawPattern + ")$";
     int matchLength = 0;
     int valueLength = value.length();
     int matchOffset = ScriptRegexp(pattern, TextCaseSensitive).match(value, 0, &matchLength);
-    return matchOffset || matchLength != valueLength;
+    bool bmpMismatched = matchOffset != 0 || matchLength != valueLength;
+    matchLength = 0;
+    matchOffset = ScriptRegexp(pattern, TextCaseSensitive, MultilineDisabled, ScriptRegexp::UTF16).match(value, 0, &matchLength);
+    bool utf16Mismatched = matchOffset != 0 || matchLength != valueLength;
+    if (bmpMismatched != utf16Mismatched)
+        UseCounter::count(element().document(), UseCounter::PatternAttributeUnicodeFlagIsIncompatible);
+    return bmpMismatched;
 }
 
 bool BaseTextInputType::supportsPlaceholder() const