[iOS] Allow overriding icuctl.dat file location.

base/ios/ios_util.mm

 // Copyright 2012 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 "base/ios/ios_util.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/sys_info.h"
 
 namespace {
+
 // Return a 3 elements array containing the major, minor and bug fix version of
 // the OS.
 const int32_t* OSVersionAsArray() {
   int32_t* digits = new int32_t[3];
   base::SysInfo::OperatingSystemVersionNumbers(
       &digits[0], &digits[1], &digits[2]);
   return digits;
 }
+
+std::string* g_icudtl_path_override = nullptr;
+
 }  // namespace
 
 namespace base {
 namespace ios {
 
 // When dropping iOS7 support, also address issues listed in crbug.com/502968.
 bool IsRunningOnIOS8OrLater() {
   return IsRunningOnOrLater(8, 0, 0);
 }
 
 bool IsRunningOnIOS9OrLater() {
   return IsRunningOnOrLater(9, 0, 0);
 }
 
 bool IsRunningOnOrLater(int32_t major, int32_t minor, int32_t bug_fix) {
   static const int32_t* current_version = OSVersionAsArray();
   int32_t version[] = {major, minor, bug_fix};
   for (size_t i = 0; i < arraysize(version); i++) {
     if (current_version[i] != version[i])
       return current_version[i] > version[i];
   }
   return true;
 }
 
 bool IsInForcedRTL() {
   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
   return [defaults boolForKey:@"NSForceRightToLeftWritingDirection"];
 }
 
+void OverridePathOfEmbeddedICU(const char* path) {
+  DCHECK(!g_icudtl_path_override);
+  g_icudtl_path_override = new std::string(path);
+}
+
+FilePath FilePathOfEmbeddedICU() {
+  if (g_icudtl_path_override) {
+    return FilePath(*g_icudtl_path_override);
+  }
+  return FilePath();
+}
+
 }  // namespace ios
 }  // namespace base