Seeing consistent failure to merge:
https://uberchromegw.corp.google.com/i/internal.client.clank/builders/arm64-unpublished-builder?numbuilds=50

@@@STEP_CURSOR@Merge SystemWebViewGoogle.apk.Merge SystemWebViewGoogle.apk@@@
@@@STEP_STARTED@@@
python -u /b/build/slave/arm64-unpublished-builder/build/src/android_webview/tools/apk_merger.py --apk_32bit /b/build/slave/arm64-unpublished-builder/build/src/out_arm-unpublished-builder/out/Debug/apks/SystemWebViewGoogle.apk --out_apk /b/build/slave/arm64-unpublished-builder/build/src/out/Debug/apks/SystemWebViewGoogle.apk --shared_library libwebviewchromium.so --zipalign_path /b/build/slave/arm64-unpublished-builder/build/src/third_party/android_tools/sdk/build-tools/23.0.1/zipalign --keystore_path /b/build/slave/arm64-unpublished-builder/build/src/build/android/ant/chromium-debug.keystore --key_name chromiumdebugkey --key_password chromium --apk_64bit /b/build/slave/arm64-unpublished-builder/build/src/out/Debug/apks/SystemWebViewGoogle_64.apk --debug
in dir /b/build/slave/arm64-unpublished-builder/build:
 cmd: ['python', '-u', '/b/build/slave/arm64-unpublished-builder/build/src/android_webview/tools/apk_merger.py', '--apk_32bit', '/b/build/slave/arm64-unpublished-builder/build/src/out_arm-unpublished-builder/out/Debug/apks/SystemWebViewGoogle.apk', '--out_apk', '/b/build/slave/arm64-unpublished-builder/build/src/out/Debug/apks/SystemWebViewGoogle.apk', '--shared_library', 'libwebviewchromium.so', '--zipalign_path', '/b/build/slave/arm64-unpublished-builder/build/src/third_party/android_tools/sdk/build-tools/23.0.1/zipalign', '--keystore_path', '/b/build/slave/arm64-unpublished-builder/build/src/build/android/ant/chromium-debug.keystore', '--key_name', 'chromiumdebugkey', '--key_password', 'chromium', '--apk_64bit', '/b/build/slave/arm64-unpublished-builder/build/src/out/Debug/apks/SystemWebViewGoogle_64.apk', '--debug']
 name: Merge SystemWebViewGoogle.apk.Merge SystemWebViewGoogle.apk
full environment:
 AWS_CREDENTIAL_FILE: /b/build/site_config/.boto
 BOTO_CONFIG: /b/build/site_config/.boto
 BUILDBOT_BLAMELIST: [u'clank-buildbot@google.com']
 BUILDBOT_BRANCH: origin/master
 BUILDBOT_BUILDBOTURL: https://uberchromegw.corp.google.com/i/internal.client.clank/
 BUILDBOT_BUILDERNAME: arm64-unpublished-builder
 BUILDBOT_BUILDNUMBER: 2888
 BUILDBOT_CLOBBER: 
 BUILDBOT_GOT_REVISION: None
 BUILDBOT_MASTERNAME: internal.client.clank
 BUILDBOT_REVISION: a637704c9ffcf9bbf437a435fa65e85c10be74d9
 BUILDBOT_SCHEDULER: clank_arm_unpublished_build_trigger
 BUILDBOT_SLAVENAME: slave74-c7
 CHROME_HEADLESS: 1
 DISPLAY: :0.0
 GIT_USER_AGENT: linux2 git/2.9.3 slave74-c7.c.chromecompute.google.com.internal
 HOME: /home/chrome-bot
 LANG: en_US.UTF-8
 PAGER: cat
 PATH: /home/chrome-bot/slavebin:/b/depot_tools:/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
 PWD: /b/build/slave/arm64-unpublished-builder/build
 PYTHONPATH: /b/build/site_config:/b/build/scripts:/b/build/scripts/release:/b/build/third_party:/b/build/third_party/requests_2_10_0:/b/build_internal/site_config:/b/build_internal/symsrc:/b/build/slave:/b/build/third_party/buildbot_slave_8_4:/b/build/third_party/twisted_10_2:
 TESTING_SLAVENAME: slave74-c7
 USER: chrome-bot
 USERNAME: chrome-bot

@@@STEP_NEST_LEVEL@1@@@
found differing files: ['classes.dex'] in /tmp/tmpvSLDfT/64_bit and /tmp/tmpvSLDfT/32_bit
step returned non-zero exit code: 1
@@@STEP_FAILURE@@@