Convert app_launch_index and page_index from int to StringOrdinal.

chrome/common/string_ordinal.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/string_ordinal.h"
 
 #include <algorithm>
 #include <cstddef>
 
 #include "base/basictypes.h"
@@ skipping 156 matching lines @@
 
 StringOrdinal::StringOrdinal(const std::string& string_ordinal)
     : string_ordinal_(string_ordinal),
       is_valid_(IsValidStringOrdinal(string_ordinal_)) {
 }
 
 StringOrdinal::StringOrdinal() : string_ordinal_(""),
                                  is_valid_(false) {
 }
 
+StringOrdinal StringOrdinal::CreateInitialOrdinal() {
+  return StringOrdinal(std::string(1, kMidDigit));
+}
+
 bool StringOrdinal::IsValid() const {
   return is_valid_;
 }
 
 bool StringOrdinal::LessThan(const StringOrdinal& other) const {
   CHECK(IsValid());
   CHECK(other.IsValid());
   return string_ordinal_ < other.string_ordinal_;
 }
 
@@ skipping 44 matching lines @@
   // Even though |end| is already a valid StringOrdinal that is greater than
   // |*this|, we don't return it because we wouldn't have much space after
   // it to insert potential future values.
   return CreateBetween(StringOrdinal(end));
 }
 
 std::string StringOrdinal::ToString() const {
   CHECK(IsValid());
   return string_ordinal_;
 }
+
+bool StringOrdinalLessThan::operator() (const StringOrdinal& lhs,
+                                        const StringOrdinal& rhs) const {
+  return lhs.LessThan(rhs);
+}