Fix Android build in gn_build.sh

[austinh0]

Problem

After #9876 and #9996, set_up_android_deps.py and generate_jars_for_test.py are a prerequisite for Android builds. They were added to the Android build scripts, but I missed gn_build.sh because it uses target_os=all.

Change overview

• Invoke JAR generation scripts in gn_build.sh

Testing

gn_build.sh passes

[mspang]

These steps should be part of the bootstrap.

[austinh0]

These steps should be part of the bootstrap.

I don't think set_up_android_deps.py should be in the bootstrap - it downloads different JARs with any changes to third_party/android_deps/android_deps.gradle.

generate_jars_for_test.py would make more sense in the bootstrap, but since it writes the JARs to /tmp I was afraid of them being cleared. Would we prefer generating those JARs somewhere in-tree, and then just gitignore that folder?

[jonsmirl]

This script does not work on Linux which prevents the Android build from working.

jonsmirl@ares:/aosp/chip$ python3 build/chip/java/tests/generate_jars_for_test.py
/home/jonsmirl/aosp/chip/build/chip/java/tests/IncludedInJar.java:4: error: cannot find symbol
IncludedInChildJar includedInChildJar;
^
symbol: class IncludedInChildJar
location: class IncludedInJar
1 error
Traceback (most recent call last):
File "/home/jonsmirl/aosp/chip/build/chip/java/javac_runner.py", line 146, in
sys.exit(main())
File "/home/jonsmirl/aosp/chip/build/chip/java/javac_runner.py", line 130, in main
retcode = subprocess.check_call(java_args + args.rest)
File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/bin/javac', '-d', '/tmp/chip_java_build_test/classes', '/home/jonsmirl/aosp/chip/build/chip/java/tests/IncludedInJar.java']' returned non-zero exit status 1.
Traceback (most recent call last):
File "build/chip/java/tests/generate_jars_for_test.py", line 50, in
sys.exit(main())
File "build/chip/java/tests/generate_jars_for_test.py", line 45, in main
generateJar(test_dir + '/IncludedInJar.java', 'prebuilt_jar.jar')
File "build/chip/java/tests/generate_jars_for_test.py", line 30, in generateJar
subprocess.check_call(javac_runner_command)
File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['python3', '/home/jonsmirl/aosp/chip/build/chip/java/javac_runner.py', '--classdir', '/tmp/chip_java_build_test/classes', '--outfile', '/tmp/chip_java_build_test/prebuilt_jar.classlist', '--build-config', '/home/jonsmirl/aosp/chip/build/chip/java/tests/empty_build_config.json', '--', '-d', '/tmp/chip_java_build_test/classes', '/home/jonsmirl/aosp/chip/build/chip/java/tests/IncludedInJar.java']' returned non-zero exit status 1.
jonsmirl@ares:~/aosp/chip$