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

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

Index: testing/android/junit/java/src/org/chromium/testing/local/PackageFilter.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/PackageFilter.java b/testing/android/junit/java/src/org/chromium/testing/local/PackageFilter.java
new file mode 100644
index 0000000000000000000000000000000000000000..4d6a580d47f587708ac2f4b0301c276837b89b6c
--- /dev/null
+++ b/testing/android/junit/java/src/org/chromium/testing/local/PackageFilter.java
@@ -0,0 +1,41 @@
+// 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.manipulation.Filter;
+
+/**
+ *  Filters tests based on the package.
+ */
+class PackageFilter extends Filter {
+
+    private final String mFilterString;
+
+    /**
+     *  Creates the filter.
+     */
+    public PackageFilter(String filterString) {
+        mFilterString = filterString;
+    }
+
+    /**
+     *  Determines whether or not a test with the provided description should
+     *  run based on its package.
+     */
+    @Override
+    public boolean shouldRun(Description description) {
+        return description.getTestClass().getPackage().getName().equals(mFilterString);
+    }
+
+    /**
+     *  Returns a description of this filter.
+     */
+    @Override
+    public String describe() {
+        return "package-filter: " + mFilterString;
+    }
+
+}