fix know issues in RenderText

views/controls/textfield/textfield_views_model.cc

Index: views/controls/textfield/textfield_views_model.cc
===================================================================
--- views/controls/textfield/textfield_views_model.cc	(revision 102037)
+++ views/controls/textfield/textfield_views_model.cc	(working copy)
@@ -320,7 +320,10 @@
   if (HasCompositionText())
     ConfirmCompositionText();
   size_t save = GetCursorPosition();
-  MoveCursorRight(gfx::LINE_BREAK, false);
+  if (render_text_->GetTextDirection() == base::i18n::LEFT_TO_RIGHT)
+    MoveCursorRight(gfx::LINE_BREAK, false);
+  else
+    MoveCursorLeft(gfx::LINE_BREAK, false);
   InsertText(text);
   render_text_->SetCursorPosition(save);
   ClearSelection();
@@ -338,7 +341,9 @@
   }
   if (GetText().length() > GetCursorPosition()) {
     size_t cursor_position = GetCursorPosition();
-    ExecuteAndRecordDelete(cursor_position, cursor_position + 1, true);
+    size_t next_grapheme_index =
+        render_text_->GetIndexOfNextGrapheme(cursor_position);
+    ExecuteAndRecordDelete(cursor_position, next_grapheme_index, true);
     return true;
   }
   return false;
@@ -656,7 +661,7 @@
   } else if (!HasSelection()) {
     size_t cursor = GetCursorPosition();
     gfx::SelectionModel sel(render_text_->selection_model());
-    sel.set_selection_start(cursor + text.length());
+    sel.set_selection_start(render_text_->GetIndexOfNextGrapheme(cursor));
     render_text_->MoveCursorTo(sel);
   }
   // Edit history is recorded in InsertText.