Functions to create and manipulate x-callback-url URLs.

ios/chrome/common/BUILD.gn

Index: ios/chrome/common/BUILD.gn
diff --git a/ios/chrome/common/BUILD.gn b/ios/chrome/common/BUILD.gn
index cb5f778e91b683eb23740c19cf082a97936b86a0..8cb39fa36591ebc8e8d9b3c653510c37cdd3d671 100644
--- a/ios/chrome/common/BUILD.gn
+++ b/ios/chrome/common/BUILD.gn
@@ -10,6 +10,8 @@ source_set("common") {
     "material_timing.mm",
     "string_util.h",
     "string_util.mm",
+    "x_callback_url.cc",
+    "x_callback_url.h",
   ]
 
   deps = [
@@ -17,6 +19,8 @@ source_set("common") {
     "//components/version_info",
     "//ios/chrome/common/app_group:main_app",
     "//ios/chrome/common/physical_web:physical_web",
+    "//net",
+    "//url",
   ]
 
   libs = [ "QuartzCore.framework" ]
@@ -26,6 +30,7 @@ source_set("unit_tests") {
   testonly = true
   sources = [
     "string_util_unittest.mm",
+    "x_callback_url_unittest.cc",
   ]
   deps = [
     ":common",