Implement eliding/truncating at end in RenderText

base/i18n/rtl.h

Index: base/i18n/rtl.h
diff --git a/base/i18n/rtl.h b/base/i18n/rtl.h
index c80d2f85777e6d31745057381618011fa549d45c..aa5f6810a9b0a8f38b9870fbc862ec8313ccfa29 100644
--- a/base/i18n/rtl.h
+++ b/base/i18n/rtl.h
@@ -64,7 +64,7 @@ BASE_I18N_EXPORT bool ICUIsRTL();
 BASE_I18N_EXPORT TextDirection GetTextDirectionForLocale(
     const char* locale_name);
 
-// Given the string in |text|, returns the directionality of the first
+// Given the string in |text|, returns the directionality of the first or last
 // character with strong directionality in the string. If no character in the
 // text has strong directionality, LEFT_TO_RIGHT is returned. The Bidi
 // character types L, LRE, LRO, R, AL, RLE, and RLO are considered as strong
@@ -72,6 +72,8 @@ BASE_I18N_EXPORT TextDirection GetTextDirectionForLocale(
 // for more information.
 BASE_I18N_EXPORT TextDirection GetFirstStrongCharacterDirection(
     const string16& text);
+BASE_I18N_EXPORT TextDirection GetLastStrongCharacterDirection(
+    const string16& text);
 
 // Given the string in |text|, returns LEFT_TO_RIGHT or RIGHT_TO_LEFT if all the
 // strong directionality characters in the string are of the same