[iOS/GN] Fix compilation of ios_chrome_unittests with gn.

build/toolchain/mac/BUILD.gn

 # Copyright (c) 2013 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.
 
 # TODO(brettw) Use "gcc_toolchain.gni" like the Linux toolchains. This requires
 # some enhancements since the commands on Mac are slightly different than on
 # Linux.
 
 import("../goma.gni")
 import("//build/config/ios/ios_sdk.gni")
@@ skipping 271 matching lines @@
   toolchain_os = "mac"
   prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                        root_build_dir)
   cc = "${goma_prefix}$prefix/clang"
   cxx = "${goma_prefix}$prefix/clang++"
   ld = cxx
   is_clang = true
 }
 
 mac_toolchain("ios_clang_arm") {
-  # TODO(GYP): Do we need ios_clang_armv7 and ios_clang_arm64 ?
   toolchain_cpu = "arm"
   toolchain_os = "mac"
 
   # TODO(GYP): We need to support being able to use the version of clang
   # shipped w/ XCode instead of the one pulled from upstream.
   prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                        root_build_dir)
   cc = "${goma_prefix}$prefix/clang"
   cxx = "${goma_prefix}$prefix/clang++"
   ld = cxx
   is_clang = true
 }
 
+mac_toolchain("ios_clang_armv7") {
+  toolchain_cpu = "armv7"
+  toolchain_os = "mac"
+
+  # TODO(GYP): We need to support being able to use the version of clang
+  # shipped w/ XCode instead of the one pulled from upstream.
+  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
+                       root_build_dir)
+  cc = "${goma_prefix}$prefix/clang"
+  cxx = "${goma_prefix}$prefix/clang++"
+  ld = cxx
+  is_clang = true
+}
+
+mac_toolchain("ios_clang_arm64") {
+  toolchain_cpu = "arm64"
+  toolchain_os = "mac"
+
+  # TODO(GYP): We need to support being able to use the version of clang
+  # shipped w/ XCode instead of the one pulled from upstream.
+  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
+                       root_build_dir)
+  cc = "${goma_prefix}$prefix/clang"
+  cxx = "${goma_prefix}$prefix/clang++"
+  ld = cxx
+  is_clang = true
+}
+
 mac_toolchain("arm") {
   toolchain_cpu = "arm"
   toolchain_os = "mac"
   cc = "${goma_prefix}/gcc"
   cxx = "${goma_prefix}/g++"
   ld = cxx
   is_clang = false
 }
 
 mac_toolchain("clang_x64") {
   toolchain_cpu = "x64"
   toolchain_os = "mac"
   prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                        root_build_dir)
   cc = "${goma_prefix}$prefix/clang"
   cxx = "${goma_prefix}$prefix/clang++"
   ld = cxx
   is_clang = true
 }
 
 mac_toolchain("x64") {
   toolchain_cpu = "x64"
   toolchain_os = "mac"
   cc = "${goma_prefix}/gcc"
   cxx = "${goma_prefix}/g++"
   ld = cxx
   is_clang = false
 }