Make base_unittests_apk actually work

tools/android/md5sum/BUILD.gn

+# Copyright 2014 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.
+
+# GYP: //tools/android/md5sum/md5sum.gyp:md5sum
+group("md5sum") {
+  datadeps = [
+    ":md5sum_bin($host_toolchain)",
+    ":md5sum_bin($default_toolchain)",
+    ":md5sum_prepare_dist($default_toolchain)",
+    ":md5sum_copy_host($host_toolchain)",
+  ]
+  # TODO(cjhopman): Remove once group datadeps are fixed.
+  deps = datadeps
+}
+
+# GYP: //tools/android/md5sum/md5sum.gyp:md5sum_bin_device (and md5sum_bin_host)
+executable("md5sum_bin") {
+  sources = [
+    "md5sum.cc"
+  ]
+  deps = [
+    "//base"
+  ]
+
+  # TODO(GYP)
+  #'conditions': [
+  #[ 'order_profiling!=0 and OS=="android"', {
+  #'dependencies': [ '../../../tools/cygprofile/cygprofile.gyp:cygprofile', ],
+  #}],
+  #],
+}
+
+if (current_toolchain == default_toolchain) {
+  import("//build/config/android/rules.gni")
+
+  # GYP: //tools/android/md5sum/md5sum.gyp:md5sum_stripped_device_bin
+  create_native_executable_dist("md5sum_prepare_dist") {
+    dist_dir = "$root_build_dir/md5sum_dist"
+    binary = "$root_build_dir/exe.stripped/md5sum_bin"
+  }
+} else {
+  # GYP: //tools/android/md5sum/md5sum.gyp:md5sum_bin_host
+  copy("md5sum_copy_host") {
+    sources = [
+      "$root_out_dir/md5sum_bin"
+    ]
+    outputs = [
+      "$root_build_dir/md5sum_bin_host"
+    ]
+  }
+}
+