Log runTests so that it shows up in logcat dumps.

04-27 14:41:32.303 11507 11538 I NativeTest: runTests: --list-tests
    04-27 14:41:32.321 11507 11538 I NativeTest: runTests finished
    ...
    04-27 14:41:34.742 11585 11615 I NativeTest: runTests: --gtest_filter=TracePerfTest.Run/native_trex_200 --verbose --calibration-time 2 --calibration --warmup-loops 2 --isolated-script-test-output=/sdcard/Download/temp_file-cbce720a15e62e25
    04-27 14:41:56.628 11585 11615 I NativeTest: runTests finished

Bug: angleproject:7242
Change-Id: I5c03501982d6b268c0dd83d71ce82080fb3c551a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3611063
Commit-Queue: Roman Lavrov <romanl@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Auto-Submit: Roman Lavrov <romanl@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

src/tests/test_utils/runner/android/java/src/com/android/angle/test/AngleNativeTest.java

@@ -157,7 +157,9 @@ public class AngleNativeTest
 
     private void runTests(Activity activity)
     {
+        Log.i(TAG, "runTests: " + mCommandLineFlags.toString());
         nativeRunTests(mCommandLineFlags.toString(), mCommandLineFilePath, mStdoutFilePath);
+        Log.i(TAG, "runTests finished");
         activity.finish();
         mReporter.testRunFinished(Process.myPid());
     }