Cleaning codepoints/grapheme mess; it also helps with ICU API

Renamed all codepoints into utf16Index

Change-Id: Ie915395a56ac825637f6dbb25824cd1635a5b0a6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/296438
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
diff --git a/modules/skparagraph/samples/SampleParagraph.cpp b/modules/skparagraph/samples/SampleParagraph.cpp
index 4ddac51..28f3207 100644
--- a/modules/skparagraph/samples/SampleParagraph.cpp
+++ b/modules/skparagraph/samples/SampleParagraph.cpp
@@ -2873,6 +2873,8 @@
       font_collection->getParagraphCache()->turnOn(false);
 
         const std::u16string text = u"β€οΈπŸ•΅πŸΎ‍♀️ πŸ•΅πŸΎ πŸ‘©πŸΎ‍βš•οΈ πŸ‘¨πŸΎ‍βš•οΈ πŸ‘©πŸΎ‍🌾 πŸ‘¨πŸΎ‍🌾 πŸ‘©πŸΎ‍🍳 πŸ‘¨πŸΎ‍🍳 πŸ‘©πŸΎ‍πŸŽ“ πŸ‘¨πŸΎ‍πŸŽ“ πŸ‘©πŸΎ‍🎀 πŸ‘¨πŸΎ‍🎀 πŸ‘©πŸΎ‍🏫 πŸ‘¨πŸΎ‍🏫 πŸ‘©πŸΎ‍🏭 πŸ‘¨πŸΎ‍🏭 πŸ‘©πŸΎ‍πŸ’» πŸ‘¨πŸΎ‍πŸ’» πŸ‘©πŸΎ‍πŸ’Ό πŸ‘¨πŸΎ‍πŸ’Ό πŸ‘©πŸΎ‍πŸ”§ πŸ‘¨πŸΎ‍πŸ”§ πŸ‘©πŸΎ‍πŸ”¬ πŸ‘¨πŸΎ‍πŸ”¬ πŸ‘©πŸΎ‍🎨 πŸ‘¨πŸΎ‍🎨 πŸ‘©πŸΎ‍πŸš’ πŸ‘¨πŸΎ‍πŸš’ πŸ‘©πŸΎ‍✈️ πŸ‘¨πŸΎ‍✈️ πŸ‘©πŸΎ‍πŸš€ πŸ‘¨πŸΎ‍πŸš€ πŸ‘©πŸΎ‍βš–οΈ πŸ‘¨πŸΎ‍βš–οΈ 🀢🏾 πŸŽ…πŸΎ";
+            //u"\uD83D\uDC69\u200D\uD83D\uDC69\u200D\uD83D\uDC66\uD83D\uDC69\u200D\uD83D\uDC69\u200D\uD83D\uDC67\u200D\uD83D\uDC67\uD83C\uDDFA\uD83C\uDDF8";
+
         canvas->drawColor(SK_ColorWHITE);
 
         ParagraphStyle paragraph_style;