[iOS] Allow overriding icuctl.dat file location.

base/ios/ios_util.mm

Index: base/ios/ios_util.mm
diff --git a/base/ios/ios_util.mm b/base/ios/ios_util.mm
index 627fb403e1980d7b482d848d4bfba846e0fec8ab..bc10d19e8f6a54931a38915f83d831e14f1597ac 100644
--- a/base/ios/ios_util.mm
+++ b/base/ios/ios_util.mm
@@ -11,6 +11,7 @@
 #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() {
@@ -19,6 +20,9 @@ const int32_t* OSVersionAsArray() {
       &digits[0], &digits[1], &digits[2]);
   return digits;
 }
+
+std::string* g_icudtl_path_override = nullptr;
+
 }  // namespace
 
 namespace base {
@@ -48,5 +52,17 @@ bool IsInForcedRTL() {
   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