Revert of Revert of [Android] JUnit runner + gyp changes.

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

Index: testing/android/junit/java/src/org/chromium/testing/local/GtestComputer.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/GtestComputer.java b/testing/android/junit/java/src/org/chromium/testing/local/GtestComputer.java
new file mode 100644
index 0000000000000000000000000000000000000000..3ef6d15c0c92ec141c19ac461cef81a7fa0e1a29
--- /dev/null
+++ b/testing/android/junit/java/src/org/chromium/testing/local/GtestComputer.java
@@ -0,0 +1,76 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.testing.local;
+
+import org.junit.runner.Computer;
+import org.junit.runner.Description;
+import org.junit.runner.Runner;
+import org.junit.runner.manipulation.Filter;
+import org.junit.runner.manipulation.Filterable;
+import org.junit.runner.manipulation.NoTestsRemainException;
+import org.junit.runner.notification.RunNotifier;
+import org.junit.runners.model.InitializationError;
+import org.junit.runners.model.RunnerBuilder;
+
+/**
+ *  A Computer that logs the start and end of test cases googletest-style.
+ */
+public class GtestComputer extends Computer {
+
+    private final GtestLogger mLogger;
+
+    public GtestComputer(GtestLogger logger) {
+        mLogger = logger;
+    }
+
+    /**
+     *  A wrapping Runner that logs the start and end of each test case.
+     */
+    private class GtestSuiteRunner extends Runner implements Filterable {
+        private final Runner mRunner;
+
+        public GtestSuiteRunner(Runner contained) {
+            mRunner = contained;
+        }
+
+        public Description getDescription() {
+            return mRunner.getDescription();
+        }
+
+        public void run(RunNotifier notifier) {
+            long startTimeMillis = System.currentTimeMillis();
+            mLogger.testCaseStarted(mRunner.getDescription(),
+                    mRunner.getDescription().testCount());
+            mRunner.run(notifier);
+            mLogger.testCaseFinished(mRunner.getDescription(),
+                    mRunner.getDescription().testCount(),
+                    System.currentTimeMillis() - startTimeMillis);
+        }
+
+        public void filter(Filter filter) throws NoTestsRemainException {
+            if (mRunner instanceof Filterable) {
+                ((Filterable)mRunner).filter(filter);
+            }
+        }
+    }
+
+    /**
+     *  Returns a suite of unit tests with each class runner wrapped by a
+     *  GtestSuiteRunner.
+     */
+    @Override
+    public Runner getSuite(final RunnerBuilder builder, Class<?>[] classes)
+            throws InitializationError {
+        return super.getSuite(
+                new RunnerBuilder() {
+                    @Override
+                    public Runner runnerForClass(Class<?> testClass) throws Throwable {
+                        return new GtestSuiteRunner(builder.runnerForClass(testClass));
+                    }
+                }, classes);
+    }
+
+}
+