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This is a reland of 10f4dd89

I disabled the gradle build when !use_platform_icu_alternatives so Android bots
continue to build successfully.  I also moved cronet_maven/ output directory to
cronet/maven/ so it can be uploaded by the bots.

Original change's description:
> [Cronet] Build maven modules and test by building sample app with gradle
>
> 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}

Change-Id: Ieba6842b48d0b8e97ca1dc6686080cb31a87ed95
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet

TBR=estevenson@chromium.org
Eric already approved the build/ change in https://chromium-review.googlesource.com/998019

Change-Id: Ieba6842b48d0b8e97ca1dc6686080cb31a87ed95
Reviewed-on: https://chromium-review.googlesource.com/1037723
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555157}