[code coverage] Only instrument Java class files related to affected source files for per-CL

Right now Java per-CL coverage instrument everything as full code base coverage.
To only instrument class files related to affected files in a CL, we can:
1. Extract class files only related to affected source files in a jar.
2. Instrument these extracted class files.
3. Extract unaffected members from original jar.
4. Zip everything out to output path.

Bug: 1001387
Change-Id: Iaf6a75c7f8005b5d64eee22bc604f25d0c2fcd8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797109
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Yun Liu <yliuyliu@google.com>
Cr-Commit-Position: refs/heads/master@{#697661}

build/android/docs/coverage.md

@@ -17,7 +17,7 @@ class files and runtime **.exec** files. Then we need to process them using the
 
   ```gn
   target_os = "android"
-  jacoco_coverage = true
+  use_jacoco_coverage = true
   ```
 
    Now when building, pre-instrumented files will be created in the build directory.