commit 9452b8dc38a030a99b4493b51e85e1acd44db93e
author Peter Wen <wnwen@chromium.org> Tue Apr 19 20:33:57 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Tue Apr 19 20:33:57 2022
tree 39b9f0149543c45828d25666c326d691baa6fa74
parent b21d16741d78e65297601a354f6bdb361ee9bfd5

Android: Add dep_operations.py

Design doc: http://go/gn-deps

This CL is a follow-up to https://crrev.com/c/3217679, consolidating
split_dep.py as an operation of the new dep_operations.py and adding a
new operation to remove dep(s).

When removing one or more deps, each time the dep is found, all targets
are built. If there are any failures or if no targets are built, the
dep is not removed. Otherwise if everything compiles successfully the
dep is removed. This is repeated until all build files are processed.

Because ninja is used to build all targets, the remove command cannot be
run multi-processed like the split command.

Usage example:
$ tools/android/modularization/gn/dep_operations.py remove \
  //build/android:build_java

Output is similar to the split command. Typically these two commands are
used together to split out deps and then to remove the unnecessary ones
so that only the necessary ones are added.

Example combination:
$ tools/android/modularization/gn/dep_operations.py split \
  //base:base_java //build/android:build_java
$ tools/android/modularization/gn/dep_operations.py remove \
  //build/android:build_java

Multiple deps to remove or split is supported to make it easier to work
with. For example, if a java_group should be inlined, it can be first
split into its deps and then all can be removed (if the targets still
build). One caveat is that for the remove command the java_group parent
dep should come first so it can always be removed.

Bug: 1258168
Change-Id: I20e5f6c4fad0a9b7528c405a376673af1fdf3589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3521864
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#993877}