This resolves#5523
While bumping `com.android.tools.build:gradle:3.1.2` to `3.3.0`, some other plugins/artifacts/maven repo/buildscripts have to be updated:
- gradle (wrapper) need to upgrade to 4.10.x
- protobuf gradle plugin need to bump a version compatible with gradle version.
- need add `google()` and `jcenter()` repos for android (otherwise `com.android.tools.build:aapt2:3.3.0x` and `trove4j` will not be found resp.)
- need to accept license for Android "build-tools;28.0.3" in kokoro env.
This PR adds an automatic gradle format checker and reformats all the *.gradle files. After this, new changes to *.gradle files will fail to build if not in good format, just like checkStyle failure.
The new jmh plugin fixes a warning for the newer version of Gradle.
The new AppEngine plugin still produces a warning, but updating it
anyway so people know that upgrading the plugin doesn't fix the problem.
The new android-maven plugin fixes a build problem with the newer
Gradle.
The Visual Studio fixes were necessary starting ~4.4.
https://github.com/gradle/gradle-native/issues/34#issuecomment-335222096
describes the change in behavior.
There's nothing immediately being used as part of this update. It's just
to keep us current and to get us over that Visual Studio change hump.