Streamline basic TF Android Kokoro builds

PiperOrigin-RevId: 295244896
Change-Id: Id3b67f3b768149d8e0f7f0d4c4f4b9bb830fdf6b

tensorflow/tools/ci_build/builds/android.sh

@@ -20,23 +20,23 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "${SCRIPT_DIR}/builds_common.sh"
 configure_android_workspace
 
-# The Bazel Android demo and Makefile builds are intentionally built for x86_64
-# and armeabi-v7a respectively to maximize build coverage while minimizing
-# compilation time. For full build coverage and exposed binaries, see
-# android_full.sh
+# The Bazel builds are intentionally built for x86 and arm64 to maximize build
+# coverage while minimizing compilation time. For full build coverage and
+# exposed binaries, see android_full.sh
 
-echo "========== TensorFlow Demo Build Test =========="
+echo "========== TensorFlow Basic Build Test =========="
 TARGETS=
-TARGETS+=" //tensorflow/examples/android:tensorflow_demo"
-# Also build the Eager Runtime so it remains compatible with Android for the
+# Building the Eager Runtime ensures compatibility with Android for the
 # benefits of clients like TensorFlow Lite. For now it is enough to build only
-# :execute, which what TF Lite needs.
+# :execute, which what TF Lite needs. Note that this does *not* build the
+# full set of mobile ops/kernels, as that can be prohibitively expensive.
 TARGETS+=" //tensorflow/core/common_runtime/eager:execute"
 # Enable sandboxing so that zip archives don't get incorrectly packaged
 # in assets/ dir (see https://github.com/bazelbuild/bazel/issues/2334)
 # TODO(gunan): remove extra flags once sandboxing is enabled for all builds.
 bazel --bazelrc=/dev/null build \
-    --compilation_mode=opt --cxxopt=-std=c++1y --fat_apk_cpu=x86_64 \
+    --compilation_mode=opt --cxxopt=-std=c++14 \
+    --config=android_arm64 --fat_apk_cpu=x86,arm64-v8a \
     --spawn_strategy=sandboxed --genrule_strategy=sandboxed \
     --define=grpc_no_ares=true \
     ${TARGETS}

tensorflow/tools/ci_build/builds/android_full.sh

@@ -49,7 +49,6 @@ do
         //tensorflow/examples/android:libtensorflow_demo.so \
         //tensorflow/tools/benchmark:benchmark_model
 
-    copy_lib bazel-bin/tensorflow/core/libandroid_tensorflow_lib.lo
     copy_lib bazel-bin/tensorflow/tools/android/inference_interface/libtensorflow_inference.so
     copy_lib bazel-bin/tensorflow/examples/android/libtensorflow_demo.so
     copy_lib bazel-bin/tensorflow/tools/benchmark/benchmark_model