Implement Uniscribe RenderText for Windows.

base/i18n/break_iterator.h

Index: base/i18n/break_iterator.h
diff --git a/base/i18n/break_iterator.h b/base/i18n/break_iterator.h
index e49b46e68b523386644f113c4f0ef7d3537269c5..0c75a52df9b84c91732e94cf3db8f17a7adaf0ae 100644
--- a/base/i18n/break_iterator.h
+++ b/base/i18n/break_iterator.h
@@ -87,6 +87,11 @@ class BreakIterator {
   // this distinction doesn't apply and it always retuns false.
   bool IsWord() const;
 
+  // Returns true if |position| is a valid word break.
+  // Loosely follow common Windows behavior; break at word logical beginnings.
+  // TODO(msw): Consider "better" word break algorithms and other platforms.
+  bool IsWordBreakAt(size_t position);
+
   // Returns the string between prev() and pos().
   // Advance() must have been called successfully at least once for pos() to
   // have advanced to somewhere useful.