RenderTextWin: Break runs between any two characters that are not in the same code block

base/i18n/char_iterator.cc

Index: base/i18n/char_iterator.cc
diff --git a/base/i18n/char_iterator.cc b/base/i18n/char_iterator.cc
index 25efc518694c0fd480253b82f9e55dd3b598d406..58d0652e2e19f81c59f3b53e4ba5f0e2efb95fb4 100644
--- a/base/i18n/char_iterator.cc
+++ b/base/i18n/char_iterator.cc
@@ -36,6 +36,12 @@ bool UTF8CharIterator::Advance() {
   return true;
 }
 
+void UTF8CharIterator::SetPosition(int32 position) {
+  U8_SET_CP_START(str_, position, array_pos_);
+  next_pos_ = array_pos_;
+  U8_NEXT(str_, next_pos_, len_, char_);
+}
+
 UTF16CharIterator::UTF16CharIterator(const string16* str)
     : str_(reinterpret_cast<const char16*>(str->data())),
       len_(str->size()),
@@ -73,6 +79,13 @@ bool UTF16CharIterator::Advance() {
   return true;
 }
 
+void UTF16CharIterator::SetPosition(int32 position) {
+  array_pos_ = position;
+  U16_SET_CP_START(str_, 0, array_pos_);
+  next_pos_ = array_pos_;
+  ReadChar();
+}
+
 void UTF16CharIterator::ReadChar() {
   // This is actually a huge macro, so is worth having in a separate function.
   U16_NEXT(str_, next_pos_, len_, char_);