UTF-8 detector for pages missing encoding info

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

Index: third_party/WebKit/Source/platform/text/TextEncodingDetector.h
diff --git a/third_party/WebKit/Source/platform/text/TextEncodingDetector.h b/third_party/WebKit/Source/platform/text/TextEncodingDetector.h
index 12f4890fc3924d65e13de5fece8e5c8482cc968c..6cf3980979c1e4c0dfe73ecc4ec928fc9714fd9b 100644
--- a/third_party/WebKit/Source/platform/text/TextEncodingDetector.h
+++ b/third_party/WebKit/Source/platform/text/TextEncodingDetector.h
@@ -47,6 +47,12 @@ namespace blink {
 PLATFORM_EXPORT bool detectTextEncoding(const char* data, size_t length,
     const char* hintEncodingName, WTF::TextEncoding* detectedEncoding);
 
+// Given a sequence of bytes in |data| of length |len|, check if
+// the content is encoded in UTF-8. Pure ASCII text is not regarded
+// as UTF-8 in order to respect the default encoding since it can be
+// of any encoding.
+PLATFORM_EXPORT bool isUTF8Encoded(const char* data, size_t length);
+
 } // namespace blink
 
 #endif