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

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

Index: testing/android/junit/java/src/org/chromium/testing/local/RunnerFilter.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/RunnerFilter.java b/testing/android/junit/java/src/org/chromium/testing/local/RunnerFilter.java
new file mode 100644
index 0000000000000000000000000000000000000000..e32753e998676aa6dbde8388d9ce4a99681f2a5d
--- /dev/null
+++ b/testing/android/junit/java/src/org/chromium/testing/local/RunnerFilter.java
@@ -0,0 +1,45 @@
+// 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.Description;
+import org.junit.runner.RunWith;
+import org.junit.runner.manipulation.Filter;
+
+/**
+ *  Filters tests based on the Runner class annotating the test class.
+ */
+class RunnerFilter extends Filter {
+
+    private final Class<?> mRunnerClass;
+
+    /**
+     *  Creates the filter.
+     */
+    public RunnerFilter(Class<?> runnerClass) {
+        mRunnerClass = runnerClass;
+    }
+
+    /**
+     *  Determines whether or not a test with the provided description should
+     *  run based on the Runner class annotating the test class.
+     */
+    @Override
+    public boolean shouldRun(Description description) {
+        Class<?> c = description.getTestClass();
+        return c != null && c.isAnnotationPresent(RunWith.class)
+                && c.getAnnotation(RunWith.class).value() == mRunnerClass;
+    }
+
+    /**
+     *  Returns a description of this filter.
+     */
+    @Override
+    public String describe() {
+        return "runner-filter: " + mRunnerClass.getName();
+    }
+
+}
+