GN (Android): Make is_clang work for (at least for arm32)

build/config/BUILDCONFIG.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.
 
 # =============================================================================
 # PLATFORM SELECTION
 # =============================================================================
 #
 # There are two main things to set: "os" and "cpu". The "toolchain" is the name
 # of the GN thing that encodes combinations of these things.
@@ skipping 556 matching lines @@
     if (host_cpu == "x86" || host_cpu == "x64") {
       host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
     } else {
       host_toolchain = "//build/toolchain/linux:$host_cpu"
     }
   } else if (host_os == "mac") {
     host_toolchain = "//build/toolchain/mac:clang_$host_cpu"
   } else {
     assert(false, "Unknown host for android cross compile")
   }
-  set_default_toolchain("//build/toolchain/android:$current_cpu")
+  if (is_clang) {
+    set_default_toolchain("//build/toolchain/android:clang_$current_cpu")
+  } else {
+    set_default_toolchain("//build/toolchain/android:$current_cpu")
+  }
 } else if (is_linux) {
   if (is_clang) {
     host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
     set_default_toolchain("//build/toolchain/linux:clang_$current_cpu")
   } else {
     host_toolchain = "//build/toolchain/linux:$host_cpu"
     set_default_toolchain("//build/toolchain/linux:$current_cpu")
   }
   if (is_chromeos && cros_use_custom_toolchain) {
     set_default_toolchain("//build/toolchain/cros:target")
@@ skipping 30 matching lines @@
     forward_variables_from(invoker, "*")
 
     # All shared libraries must have the sanitizer deps to properly link in
     # asan mode (this target will be empty in other cases).
     if (!defined(deps)) {
       deps = []
     }
     deps += [ "//build/config/sanitizers:deps" ]
   }
 }