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This CL makes the generate_jar_jni rule behave similarly as
generate_jni; it takes a custom jni_generator_include and
the generated files are placed in the same folder as for
the generate_jni targets.

Bug: webrtc:8278
Change-Id: I5317ff1efead452f275a9a3d415793bde0e344d0
Reviewed-on: https://chromium-review.googlesource.com/757377
Commit-Queue: Magnus Jedvert <magjed@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515843}