Add initial travis-CI build config for bazel.build.

.bazelrc

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+test --test_output=errors
+test --test_size_filters=-large,-enormous

.bazelrc.travis

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+# This is from Bazel's former travis setup, to avoid blowing up the RAM usage.
+startup --host_jvm_args=-Xmx2500m
+startup --host_jvm_args=-Xms2500m
+startup --batch
+test --ram_utilization_factor=10
+
+# This is so we understand failures better
+build --verbose_failures
+
+# Below this line, .travis.yml will cat the default bazelrc.
+# This is needed so Bazel starts with the base workspace in its
+# package path.

.gitignore

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+/bazel-*

.travis.yml

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+sudo: required
+dist: xenial
+
+lang: go
+
+go:
+  - 1.7.x
+
+jdk:
+  - oraclejdk8
+
+env:
+  - BAZEL_VERSION=0.4.2
+
+addons:
+  apt:
+    packages:
+      - wget
+
+cache:
+  directories:
+    - $HOME/bazel/install
+    - $HOME/bazel/outbase
+
+before_install:
+  - mkdir -p ${HOME}/bazel/install
+  - cd ${HOME}/bazel/install
+  - wget --no-clobber "https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel_${BAZEL_VERSION}-linux-x86_64.deb"
+  - chmod +x bazel_${BAZEL_VERSION}-linux-x86_64.deb
+  - sudo dpkg -i bazel_${BAZEL_VERSION}-linux-x86_64.deb
+  - sudo apt-get -f install -qqy uuid-dev
+  - cd ${TRAVIS_BUILD_DIR}
+  - mv .bazelrc .bazelrc.orig
+  - cat .bazelrc.travis .bazelrc.orig > .bazelrc
+
+script:
+  - bazel --output_base=${HOME}/bazel/outbase test //...
+
+notifications:
+  slack: istio-dev:wEEEbaabdP5ieCgDOFetA9nX