[ui/base;css] adding string template expression replacement

base/strings/string_util.h

Index: base/strings/string_util.h
diff --git a/base/strings/string_util.h b/base/strings/string_util.h
index dc3d4d762d117bd4169372997503d0f901335e65..f57bc09c80d7c1ba3ff7ee771063edd232f10268 100644
--- a/base/strings/string_util.h
+++ b/base/strings/string_util.h
@@ -10,6 +10,7 @@
 #include <ctype.h>
 #include <stdarg.h>   // va_list
 
+#include <map>
 #include <string>
 #include <vector>
 
@@ -518,6 +519,13 @@ BASE_EXPORT base::string16 JoinString(
     const std::vector<base::string16>& parts,
     const base::string16& separator);
 
+// Replace ${foo} in the format string with the value for the foo key in subst.

[Dan Beam, 2015/07/02 02:10:16]

subst -> |subst|

[dschuyler, 2015/07/07 23:05:30]

Done.

+// Additionally, any number of consecutive '$' characters is replaced by that
+// number less one. Eg $$ becomes $, $$$ becomes $$, etc.
+BASE_EXPORT std::string ReplaceStringPlaceholders(
+    const std::string& format_string,
+    const std::map<std::string, std::string>& subst);
+
 // Replace $1-$2-$3..$9 in the format string with |a|-|b|-|c|..|i| respectively.
 // Additionally, any number of consecutive '$' characters is replaced by that
 // number less one. Eg $$->$, $$$->$$, etc. The offsets parameter here can be