Enable store tombstones for swarming bots.

build/secondary/third_party/android_platform/development/scripts/BUILD.gn

 # Copyright 2017 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.
 
 group("stack_py") {
   _py_files = read_file(
           "//build/secondary/third_party/android_platform/development/scripts/stack.pydeps",
           "list lines")
-
   set_sources_assignment_filter([ "#*" ])
   sources = _py_files
   data = sources
+
+  if (target_cpu == "arm") {
+    data += ["//third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-addr2line",

[jbudorick, 2017/05/16 19:48:26]

I *think* you could do something like

  if (target_cpu == "arm") {
    data += [
        "${android_toolchain_root}/bin/arm-linux-androideabi-addr2line"
        ...
    ]
  } ...

We define the toolchain root here:
https://codesearch.chromium.org/chromium/src/build/config/android/config.gni?...

+             "//third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-objdump",
+             "//third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-c++filt"]
+  } else if (target_cpu == "arm64") {
+    data += ["//third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-addr2line",
+             "//third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-objdump",
+             "//third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-c++filt"]
+  } else if (target_cpu == "x86") {
+    data += ["//third_party/android_tools/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-addr2line",
+             "//third_party/android_tools/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-objdump",
+             "//third_party/android_tools/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-c++filt"]
+  } else if (target_cpu == "x86_64" || target_cpu == "x64") {
+    data += ["//third_party/android_tools/ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-addr2line",
+             "//third_party/android_tools/ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-objdump",
+             "//third_party/android_tools/ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-c++filt"]
+  } else if (target_cpu == "mips") {
+    data += ["//third_party/android_tools/ndk/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-addr2line",
+             "//third_party/android_tools/ndk/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-objdump",
+             "//third_party/android_tools/ndk/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-c++filt"]
+  }
 }