Add json output to Junit tests.

testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java

Index: testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java b/testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java
index d9c468d8470d5af2da99df76bb70f1ba043a69cf..3a305faff5f8dd6eb4abf8a0042acd0494b44d7c 100644
--- a/testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java
+++ b/testing/android/junit/java/src/org/chromium/testing/local/JunitTestMain.java
@@ -76,10 +76,12 @@ public final class JunitTestMain {
         JunitTestArgParser parser = JunitTestArgParser.parse(args);
 
         JUnitCore core = new JUnitCore();
-        GtestLogger logger = new GtestLogger(System.out);
-        core.addListener(new GtestListener(logger));
+        GtestLogger gtestLogger = new GtestLogger(System.out);
+        core.addListener(new GtestListener(gtestLogger));
+        JsonLogger jsonLogger = new JsonLogger(parser.getJsonOutputFile());
+        core.addListener(new JsonListener(jsonLogger));
         Class[] classes = findClassesFromClasspath();
-        Request testRequest = Request.classes(new GtestComputer(logger), classes);
+        Request testRequest = Request.classes(new GtestComputer(gtestLogger), classes);
         for (String packageFilter : parser.getPackageFilters()) {
             testRequest = testRequest.filterWith(new PackageFilter(packageFilter));
         }