I'm using EMMA coverage as documented here:
https://chromium.googlesource.com/chromium/src/+/master/build/android/docs/coverage.md

Since https://codereview.chromium.org/2501153002 this fails as follows:


ninja: Entering directory `out/android_debug_coverage'
[1/1] Regenerating ninja files
FAILED: build.ninja 
/usr/local/google/code/clank1/src/buildtools/linux64/gn --root=/usr/local/google/code/clank1/src -q gen .
ERROR Input to target not generated by a dependency.
The file:
  //out/android_debug_coverage/gen/chrome/android/java/templates/public_monochrome_application/org/chromium/chrome/browser/MonochromeApplication.java
is listed as an input or source for the target:
  //chrome/android/java/templates:public_monochrome_java__compile_java__emma_instr
but this file was not generated by any dependencies of the target. The target
that generates the file is:
  //chrome/android/java/templates:monochrome_application_class

If you have generated inputs, there needs to be a dependency path between the
two targets in addition to just listing the files. For indirect dependencies,
the intermediate ones must be public_deps. data_deps don't count since they're
only runtime dependencies. If you think a dependency chain exists, it might be
because the chain is private. Try "gn path" to analyze.
ninja: error: rebuilding 'build.ninja': subcommand failed


gn path out/android_debug_coverage //chrome/android/java/templates:public_monochrome_java__compile_java__emma_instr //chrome/android/java/templates:monochrome_application_class
//chrome/android/java/templates:public_monochrome_java__compile_java__emma_instr --[private]-->
//chrome/android/java/templates:public_monochrome_java__compile_java__process_prebuilt --[public]-->
//chrome/android/java/templates:public_monochrome_java__compile_java__process_prebuilt__filter --[private]-->
//chrome/android/java/templates:monochrome_application_class

Michael, could you take a look please?