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This change builds maven modules for Cronet.
Each maven module includes:
  1. POM file defining module and listing dependent modules
  2. Jars
  3. Proguard files (optional)
  4. Native libraries (optional)
  5. Resources (optional)
  6. Javadocs (optional)
We build four maven modules:
  1. cronet-api: the Cronet API
  2. cronet-embedded: the Cronet native implementation
  3. cronet-fallback: the Cronet fallback implementation
  4. cronet-common: Cronet implementation in common with #3 and #4

To test the maven modules, this change builds the Cronet sample app using gradle.
You can install and run the resulting app by:
  ninja -C out/Debug cronet_maven_test_build
  adb install -r out/Debug/cronet_maven/test/build/outputs/apk/debug/test-debug.apk
  adb install -r out/Debug/cronet_maven/test/build/outputs/apk/androidTest/debug/test-debug-androidTest.apk
  adb shell am instrument -w org.chromium.cronet_sample_apk.test/android.support.test.runner.AndroidJUnitRunner

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I5ed27e86f3e01dc3a6441ab449bbe942553343af
Reviewed-on: https://chromium-review.googlesource.com/998019
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554608}