Add ToString method for easy DLOG and debug support

chrome/common/custom_handlers/protocol_handler.h

Index: chrome/common/custom_handlers/protocol_handler.h
diff --git a/chrome/common/custom_handlers/protocol_handler.h b/chrome/common/custom_handlers/protocol_handler.h
index 8417ae8bfe05856a57cdae3132c26c4266ca34a4..fa49b485e5bd8ec4d74ce0ec125464951aefa837 100644
--- a/chrome/common/custom_handlers/protocol_handler.h
+++ b/chrome/common/custom_handlers/protocol_handler.h
@@ -54,6 +54,12 @@ class ProtocolHandler {
     return protocol_.empty();
   }
 
+#if !defined(NDEBUG)
+  // Returns a string representation suitable for use in debugging.
+  std::string ToString() const;
+#endif
+
+
   bool operator==(const ProtocolHandler& other) const;
   bool operator<(const ProtocolHandler& other) const;