Most of the variable export code for cc modules can be re-used for
exporting variables for java modules. Refactor this code into a more
composable structure for reuse.
Test: build/bazel/bp2build.sh
Test: manual comparison of
out/soong/soong_injection/cc_toolchain/constants.bzl
with previous output
Change-Id: Ie5a6fee08cc888b7dc69c3e324e5c3f8aa269a8f
Bazel is executed several times during the execution of soong_build.
For each bazel execution, generate a profile and save under the
BAZEL_METRICS_DIR which is defined in soong_ui.
Bug: b/174479924
Test: * USE_BAZEL_ANALYSIS=1 USE_BAZEL=1 m nothing and checked
if the cquery and graph build bazel profiles were generated.
* Verified that the generated bazel profiles were uploaded
to the local dev metrics pipeline.
Change-Id: I3d20204484dc6c5a1525a5d3eec1d62cfb33535b
