Adding a default target set for presubmits.

PiperOrigin-RevId: 270791565

tensorflow/tools/ci_build/build_scripts/PRESUBMIT_BUILD_TARGETS.sh

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+# Copyright 2019 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+#!/bin/bash
+set -x
+
+DEFAULT_BAZEL_TARGETS="//tensorflow/... -//tensorflow/compiler/..."

tensorflow/tools/ci_build/build_scripts/README.md

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+# Default targets run by presubmits.
+
+This bash script is invoked internally to run presubmits. Please only modify
+default bazel targets.