Collect spelling service feedback on Mac

chrome/common/spellcheck_marker.h

Index: chrome/common/spellcheck_marker.h
diff --git a/chrome/common/spellcheck_marker.h b/chrome/common/spellcheck_marker.h
index 551f7dcd1cdac6410e05752195d7aece8f0a375c..3b04cadb298fe974f51ccb68da103cbd930114a5 100644
--- a/chrome/common/spellcheck_marker.h
+++ b/chrome/common/spellcheck_marker.h
@@ -5,7 +5,20 @@
 #ifndef CHROME_COMMON_SPELLCHECK_MARKER_H_
 #define CHROME_COMMON_SPELLCHECK_MARKER_H_
 
-struct SpellCheckMarker {
+class SpellCheckMarker {
+ public:
+  // A predicate to test spellcheck marker validity.
+  class IsValidPredicate {
+   public:
+    typedef SpellCheckMarker argument_type;
+    explicit IsValidPredicate(size_t text_length) : text_length_(text_length) {}
+    bool operator()(const SpellCheckMarker& marker) const {
+      return marker.offset < text_length_;
+    }
+   private:
+    size_t text_length_;
+  };
+
   // IPC requires a default constructor.
   SpellCheckMarker() : hash(-1), offset(-1) {}