Enable Arm64 target arch in gyp build config

build/common.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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1290 matching lines @@
       # The version of GCC in use, set later in platforms that use GCC and have
       # not explicitly chosen to build with clang. Currently, this means all
       # platforms except Windows, Mac and iOS.
       # TODO(glider): set clang to 1 earlier for ASan and TSan builds so that
       # it takes effect here.
       ['os_posix==1 and OS!="mac" and OS!="ios" and clang==0 and asan==0 and lsan==0 and tsan==0 and msan==0', {
         'conditions': [
           ['OS=="android"', {
             # We directly set the gcc_version since we know what we use.
             'conditions': [
-              ['target_arch=="x64"', {
+              ['target_arch=="x64" or target_arch=="arm64"', {
                 'gcc_version%': 48,
               }, {
                 'gcc_version%': 46,
               }],
             ],
             'binutils_version%': 222,
           }, {
             'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
             'binutils_version%': '<!(python <(DEPTH)/build/compiler_version.py assembler)',
           }],
@@ skipping 109 matching lines @@
           'android_sdk%': '<(android_sdk_root)/platforms/android-<(android_sdk_version)',
           # Android SDK build tools (e.g. dx, aapt, aidl)
           'android_sdk_tools%': '<(android_sdk_root)/build-tools/<(android_sdk_build_tools_version)',
 
           # Android API level 14 is ICS (Android 4.0) which is the minimum
           # platform requirement for Chrome on Android, we use it for native
           # code compilation.
           'conditions': [
             ['target_arch == "ia32"', {
               'android_app_abi%': 'x86',
+              'android_gdbserver_executable%': 'gdbserver',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-x86',
               '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_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
+              'android_gdbserver_executable%': 'gdbserver64',
+              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86_64/gdbserver/gdbserver64',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-19/arch-x86_64',
               'android_toolchain%': '<(android_ndk_root)/toolchains/x86_64-4.8/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch=="arm"', {
               'conditions': [
                 ['arm_version<7', {
                   'android_app_abi%': 'armeabi',
                 }, {
                   'android_app_abi%': 'armeabi-v7a',
                 }],
               ],
+              'android_gdbserver_executable%': 'gdbserver',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-arm',
               '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',
+              'android_gdbserver_executable%': 'gdbserver64',
+              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm64/gdbserver64/gdbserver64',
+              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-19/arch-arm64',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/aarch64-linux-android-4.8/prebuilt/<(host_os)-<(android_host_arch)/bin',
+            }],
             ['target_arch == "mipsel"', {
               'android_app_abi%': 'mips',
+              'android_gdbserver_executable%': 'gdbserver',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-mips/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-mips',
               'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
           ],
         },
         # Copy conditionally-set variables out one scope.
         'android_app_abi%': '<(android_app_abi)',
+        'android_gdbserver_executable': '<(android_gdbserver_executable)',
         'android_gdbserver%': '<(android_gdbserver)',
         'android_ndk_root%': '<(android_ndk_root)',
         'android_ndk_sysroot': '<(android_ndk_sysroot)',
         'android_sdk_root%': '<(android_sdk_root)',
         'android_sdk_version%': '<(android_sdk_version)',
         'android_toolchain%': '<(android_toolchain)',
 
         'android_ndk_include': '<(android_ndk_sysroot)/usr/include',
         'android_ndk_lib': '<(android_ndk_sysroot)/usr/lib',
         'android_sdk_tools%': '<(android_sdk_tools)',
@@ skipping 1501 matching lines @@
             'inherit_from': ['Common_Base', 'x64_Base', 'Debug_Base'],
           },
           'Release_x64': {
             'inherit_from': ['Common_Base', 'x64_Base', 'Release_Base'],
           },
         }],
       ],
     },
   },
   'conditions': [
-    # TODO(jochen): Enable this on chromeos. http://crbug.com/353127 
+    # TODO(jochen): Enable this on chromeos. http://crbug.com/353127
     ['os_posix==1 and chromeos==0', {
       'target_defaults': {
         'ldflags': [
           '-Wl,--fatal-warnings',
           '-Wl,-z,now',
           '-Wl,-z,relro',
         ],
       },
     }],
     ['os_posix==1 and chromeos==0', {
@@ skipping 382 matching lines @@
                         'cflags': [
                           '-marm', # Required for frame pointer based stack traces.
                         ],
                       }],
                     ],
                   }],
                 ],
               }],
             ],
           }],
+          ['target_arch=="arm64"', {
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'conditions': [
+                  ['OS=="android"', {
+                    'cflags!': [
+                       '-fstack-protector',  # stack protector is always enabled on arm64.
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],
           ['target_arch=="mipsel"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'conditions': [
                   ['android_webview_build==0 and mips_arch_variant=="mips32r2"', {
                     'cflags': ['-mips32r2', '-Wa,-mips32r2'],
                   }],
                   ['android_webview_build==0 and mips_arch_variant!="mips32r2"', {
                     'cflags': ['-mips32', '-Wa,-mips32'],
                   }],
@@ skipping 1696 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }