[MIPS] Adding NaCl/PNaCl support for mipsel to GN

ppapi/native_client/BUILD.gn

 # Copyright 2015 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/features.gni")
 import("//build/config/nacl/config.gni")
 
 if (is_nacl) {
   group("ppapi_lib") {
     deps = [
@@ skipping 29 matching lines @@
       "//third_party/WebKit/*",
     ]
   }
 
   # TODO(phosek): We can remove this ugliness if we change the
   # IRT file name in components/nacl/browser/nacl_browser.cc
   if (current_cpu == "x86") {
     irt_cpu = "x86_32"
   } else if (current_cpu == "x64") {
     irt_cpu = "x86_64"
+  } else if (current_cpu == "mipsel") {
+    irt_cpu = "mips32"
   } else {
     irt_cpu = current_cpu
   }
   irt_name = "nacl_irt_" + irt_cpu + ".nexe"
 
   copy("nacl_irt_debug") {
     sources = [
       "${root_out_dir}/exe.unstripped/nacl_irt.nexe",
     ]
     outputs = [
@@ skipping 56 matching lines @@
   # On 32-bit Windows, we also ship the 64-bit IRT.
   if (is_win && target_cpu == "x86") {
     irt_x64_deps = [
       ":nacl_irt_debug(//build/toolchain/nacl:irt_x64)",
       ":nacl_irt_debuglink(//build/toolchain/nacl:irt_x64)",
     ]
     public_deps += irt_x64_deps
     data_deps += irt_x64_deps
   }
 }