Opened  Issue 672604  to add the new tests to the cronet bot.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3

commit 7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3
Author: kapishnikov <kapishnikov@chromium.org>
Date: Tue Dec 27 17:44:48 2016

Cronet smoke tests

1. Added test support classes that allow running the smoke tests in
   different environments against different servers. There is one
   support class for Java-only tests and one that requires H2 & QUIC.
   The concrete implementation of support classes is determined at
   runtime by reading the value of |TestSupportImplClass| from the
   Android string resource file.
2. Added two test APKs one for Java only deployment and one to test
   behavior when the native “.so” file is absent.
3. Enabled proguarding for the existing unit tests. The new APKS also
   run proguard in order to check the correctness of proguard configs
   for different deployments.
4. Added new HttpServer for Java-only scenario that does not depend on
   Chromium “base” and “net” modules.
5. Added two additional smoke QUIC & H2 tests to the existing test APK.

To run all smoke tests, execute:

ninja -C out/Debug cronet_smoketests_platform_only_instrumentation_apk \
cronet_smoketests_missing_native_library_instrumentation_apk \
cronet_test_instrumentation_apk -j 240 && \
./out/Debug/bin/run_cronet_smoketests_platform_only_instrumentation_apk && \
./out/Debug/bin/run_cronet_smoketests_missing_native_library_instrumentation_apk && \
./out/Debug/bin/run_cronet_test_instrumentation_apk \
--test-filter=org.chromium.net.smoke.*

The output jars that contain the smoke tests:
./out/Debug/lib.java/components/cronet/android/cronet_smoketests_missing_native_library_java.jar
./out/Debug/lib.java/components/cronet/android/cronet_smoketests_native_java.jar
./out/Debug/lib.java/components/cronet/android/cronet_smoketests_platform_only_java.jar

BUG= 669264 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_cronet_tester

Review-Url: https://codereview.chromium.org/2561803002
Cr-Commit-Position: refs/heads/master@{#440760}

[modify] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/BUILD.gn
[modify] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/cronet_impl_common_proguard.cfg
[modify] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/cronet_impl_native_proguard.cfg
[delete] https://crrev.com/9273ccb313e40ed1cf5fd6e049e7b63a6aeed933/components/cronet/android/test/javaperftests/proguard.cfg
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/proguard.cfg
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/res/native/values/strings.xml
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/res/native/xml/network_security_config.xml
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/res/platform_only/values/strings.xml
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/res/platform_only/xml/network_security_config.xml
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/ChromiumNativeTestSupport.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/ChromiumPlatformOnlyTestSupport.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/CronetSmokeTestCase.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/Http2Test.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/HttpTestServer.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/MissingNativeLibraryTest.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/NativeCronetTestCase.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/PlatformOnlyEngineTest.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/QuicTest.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/SmokeTestRequestCallback.java
[add] https://crrev.com/7a4cba9f6d608b3347984e3aaa6f7dfd1d9f63b3/components/cronet/android/test/smoketests/src/org/chromium/net/smoke/TestSupport.java