[Android]: Update Arm64 and x86_64 build targets to use the experimental ndk.

build/java_apk.gypi

 # Copyright (c) 2012 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.
 
 # This file is meant to be included into a target to provide a rule
 # to build Android APKs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_package_apk',
@@ skipping 170 matching lines @@
         '<(DEPTH)/base/base.gyp:chromium_android_linker',
       ],
     }],
     ['native_lib_target != ""', {
       'variables': {
         'generated_src_dirs': [ '<(native_libraries_java_dir)' ],
         'native_libs_paths': [
           '<(SHARED_LIB_DIR)/<(native_lib_target).>(android_product_extension)'
         ],
         'package_input_paths': [
-          '<(apk_package_native_libs_dir)/<(android_app_abi)/<(android_gdbserver_executable)',
+          '<(apk_package_native_libs_dir)/<(android_app_abi)/gdbserver',
         ],
       },
       'copies': [
         {
           # gdbserver is always copied into the APK's native libs dir. The ant
           # build scripts (apkbuilder task) will only include it in a debug
           # build.
           'destination': '<(apk_package_native_libs_dir)/<(android_app_abi)',
           'files': [
             '<(android_gdbserver)',
@@ skipping 553 matching lines @@
         '-DEMMA_INSTRUMENT=<(emma_instrument)',
         '-DEMMA_DEVICE_JAR=<(emma_device_jar)',
 
         '-Dbasedir=.',
         '-buildfile',
         '<(DEPTH)/build/android/ant/apk-package.xml',
       ]
     },
   ],
 }