Android: Prefix target toolchain names with "android_".

build/toolchain/android/BUILD.gn

 # Copyright 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.
 
 import("//build/config/clang/clang.gni")
 import("//build/config/sysroot.gni")  # Imports android/config.gni.
 import("//build/toolchain/gcc_toolchain.gni")
 
 # The Android GCC toolchains share most of the same parameters, so we have this
 # wrapper around gcc_toolchain to avoid duplication of logic.
@@ skipping 52 matching lines @@
     nm = _tool_prefix + "nm"
     strip = "${_tool_prefix}strip"
 
     # Don't use .cr.so for loadable_modules since they are always loaded via
     # absolute path.
     loadable_module_extension = ".so"
   }
 }
 
 template("android_gcc_toolchains_helper") {
-  android_gcc_toolchain(target_name) {
+  android_gcc_toolchain("android_$target_name") {
     forward_variables_from(invoker, "*")
     toolchain_args.is_clang = false
   }
 
-  android_gcc_toolchain("clang_$target_name") {
+  android_gcc_toolchain("android_clang_$target_name") {
     forward_variables_from(invoker, "*")
     toolchain_args.is_clang = true
   }
 }
 
 android_gcc_toolchains_helper("x86") {
   toolchain_root = x86_android_toolchain_root
   sysroot = "$android_ndk_root/$x86_android_sysroot_subdir"
   lib_dir = "usr/lib"
   binary_prefix = "i686-linux-android"
@@ skipping 44 matching lines @@
 
 android_gcc_toolchains_helper("mips64el") {
   toolchain_root = mips64_android_toolchain_root
   sysroot = "$android_ndk_root/$mips64_android_sysroot_subdir"
   lib_dir = "usr/lib64"
   binary_prefix = "mips64el-linux-android"
   toolchain_args = {
     current_cpu = "mips64el"
   }
 }