Compilation gives a lot of warnings:

[libprotobuf WARNING ../../third_party/protobuf/src/google/protobuf/compiler/java/java_file.cc:228] The optimize_for = LITE_RUNTIME option is no longer supported by protobuf Java code generator and may generate broken code. It will be ignored by protoc in the future and protoc will always generate full runtime code for Java. To use Java Lite runtime, users should use the Java Lite plugin instead. See:
  https://github.com/google/protobuf/blob/master/java/lite.md

Example compilation settings:

target_os="android"
target_cpu="arm"
enable_nacl=false
symbol_level=0
remove_webcore_debug_symbols=true
is_debug=false
dcheck_always_on=false
is_component_build=false
use_jumbo_build=true

@jkrcal, can we use this plugin or disable these warnings?