Benchmark tools: Android memtrack_helper meaningful errors.

tools/android/memtrack_helper/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.
 
 # Unwind tables create a dependency on libc++. By removing them
-# the final binary will not require anything more than libc and libdl.
+# the final binary will not require anything more than libc, libdl and liblog.
 # This makes its deployment easier in component=shared_library mode.
 config("android_binary_no_libcpp_config") {
   cflags = [
     "-fno-unwind-tables",
     "-fno-asynchronous-unwind-tables",
   ]
+  libs = [ "log" ]
 }
 
 executable("memtrack_helper") {
   sources = [
     "memtrack_helper.c",
     "memtrack_helper.h",
   ]
   configs += [ ":android_binary_no_libcpp_config" ]
 }
 
 executable("memtrack_helper_test_client") {
   sources = [
     "memtrack_helper.h",
     "memtrack_helper_test_client.c",
   ]
   configs += [ ":android_binary_no_libcpp_config" ]
 }