For x64 set android_ndk_lib to /usr/lib64.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index e94ed2c8bdd7b9051dd05172a1c897765b699e28..a7699efe4ec4aa568fa198f6bd91cce3ebe733a5 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1521,12 +1521,14 @@
               'android_app_abi%': 'x86',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-x86',
+              'android_ndk_lib_dir%': 'usr/lib',
               'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "x64"', {
               'android_app_abi%': 'x86_64',
               'android_gdbserver%': '<(android_ndk_experimental_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_experimental_root)/platforms/android-20/arch-x86_64',
+              'android_ndk_lib_dir%': 'usr/lib64',
               'android_toolchain%': '<(android_ndk_experimental_root)/toolchains/x86_64-4.8/prebuilt/<(host_os)-<(android_host_arch)/bin',
               'android_stlport_root': '<(android_ndk_experimental_root)/sources/cxx-stl/stlport',
             }],
@@ -1540,12 +1542,14 @@
               ],
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-arm',
+              'android_ndk_lib_dir%': 'usr/lib',
               'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "arm64"', {
               'android_app_abi%': 'arm64-v8a',
               'android_gdbserver%': '<(android_ndk_experimental_root)/prebuilt/android-arm64/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_experimental_root)/platforms/android-20/arch-arm64',
+              'android_ndk_lib_dir%': 'usr/lib',
               'android_toolchain%': '<(android_ndk_experimental_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
               'android_stlport_root': '<(android_ndk_experimental_root)/sources/cxx-stl/stlport',
             }],
@@ -1553,6 +1557,7 @@
               'android_app_abi%': 'mips',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-mips/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-mips',
+              'android_ndk_lib_dir%': 'usr/lib',
               'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
           ],
@@ -1567,7 +1572,7 @@
         'android_toolchain%': '<(android_toolchain)',
 
         'android_ndk_include': '<(android_ndk_sysroot)/usr/include',
-        'android_ndk_lib': '<(android_ndk_sysroot)/usr/lib',
+        'android_ndk_lib': '<(android_ndk_sysroot)/<(android_ndk_lib_dir)',
         'android_sdk_tools%': '<(android_sdk_tools)',
         'android_sdk%': '<(android_sdk)',
         'android_sdk_jar%': '<(android_sdk)/android.jar',