This adds the --depfile option to a bunch of android's build scripts
(the ones used by gn). It also adds a simple function in build_utils to
calculate the paths of the imported python files.
Currently, the written depfiles just contain that list of python files
(which is much more accurate than the way this is handled in gyp).
BUG=359249
Review URL: https://codereview.chromium.org/341823003
git-svn-id: http://src.chromium.org/svn/trunk/src/build@279546 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
This is the GN version of build/java_cpp_template.gypi.
It defines a template that wraps an action_foreach that generates .java
files using the host C preprocessor.
The major difference in the GN version is that it takes all the
generated java files and zips them together in a single .srcjar. When
such a target is included in the srcjar_deps of a java library, the
.java files in the .srcjar will be treated much like files listed in
that libraries java_sources (particularly they will be compiled and
included in the .jar/.dex).
Depends on https://crrev.com/264773014/
BUG=359249
Review URL: https://codereview.chromium.org/264923007
git-svn-id: http://src.chromium.org/svn/trunk/src/build@272775 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
cjhopman@chromium.org