[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..515562db0332a2198548e22606ddc15ff62c23fb 100644
--- a/base/ios/ios_util.mm
+++ b/base/ios/ios_util.mm
@@ -7,6 +7,7 @@
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
+#include "base/mac/foundation_util.h"
 #include "base/macros.h"
 #include "base/sys_info.h"
 
@@ -19,6 +20,9 @@ const int32_t* OSVersionAsArray() {
       &digits[0], &digits[1], &digits[2]);
   return digits;
 }
+
+static NSString* g_icudtl_path_override = nil;
+
 }  // namespace
 
 namespace base {
@@ -48,5 +52,14 @@ bool IsInForcedRTL() {
   return [defaults boolForKey:@"NSForceRightToLeftWritingDirection"];
 }
 
+void OverridePathOfEmbeddedICU(const char* path) {
+  DCHECK(!g_icudtl_path_override);
+  g_icudtl_path_override = [[NSString stringWithUTF8String:path] copy];
+}
+
+FilePath FilePathOfEmbeddedICU() {
+  return base::mac::NSStringToFilePath(g_icudtl_path_override);
+}
+
 }  // namespace ios
 }  // namespace base