Also clean up jinja + script

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/698728ae3b1ceb1cef98276d6e7fc06a1a63336f

commit 698728ae3b1ceb1cef98276d6e7fc06a1a63336f
Author: wnwen <wnwen@chromium.org>
Date: Thu Jan 12 17:37:23 2017

Android: Split up build.gradle.jinja

Increase ninja concurrency from 50 to 1000. Load templates from script
directory. No visible changes except some whitespace differences.

BUG= 680217 

Review-Url: https://codereview.chromium.org/2621413002
Cr-Commit-Position: refs/heads/master@{#443278}

[rename] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gradle/android.jinja
[add] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gradle/dependencies.jinja
[modify] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gradle/generate_gradle.py
[add] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gradle/java.jinja
[add] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gradle/root.jinja
[modify] https://crrev.com/698728ae3b1ceb1cef98276d6e7fc06a1a63336f/build/android/gyp/jinja_template.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93

commit 5ee39c9a1b872d95800d7527dbc2ffe7b16cab93
Author: wnwen <wnwen@chromium.org>
Date: Thu Jan 19 18:40:27 2017

Android: Instrumentation tests in gradle

Add instrumentation tests as androidTest for gradle projects. May
require more tweaking to get all the dependencies/files generated.

BUG= 680217 

Review-Url: https://codereview.chromium.org/2633533002
Cr-Commit-Position: refs/heads/master@{#444800}

[modify] https://crrev.com/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93/build/android/gradle/android.jinja
[modify] https://crrev.com/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93/build/android/gradle/dependencies.jinja
[modify] https://crrev.com/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93/build/android/gradle/generate_gradle.py
[modify] https://crrev.com/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93/build/android/gradle/java.jinja
[modify] https://crrev.com/5ee39c9a1b872d95800d7527dbc2ffe7b16cab93/build/android/gyp/write_build_config.py

This is about it for now, junit might come later, but we'll have to avoid compiling anything not in android sdk in the same module due to using the android application plugin.