Add initial test and build files for Robolectric unit test suites.

content/content_tests.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 2006 matching lines @@
           ],
           'variables': {
             'apk_name': 'ContentShellTest',
             'java_in_dir': 'shell/android/javatests',
             'resource_dir': 'shell/android/shell_apk/res',
             'additional_src_dirs': ['public/android/javatests/', ],
             'is_test_apk': 1,
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
+        {
+          # GN: //content/public/android:content_shell_unit_tests
+          'target_name': 'content_shell_unit_tests',
+          'type': 'none',
+          'dependencies': [
+            'content.gyp:content_java',
+            '../base/base.gyp:base_java',
+            '../base/base.gyp:base_java_test_support',
+            '../testing/android/junit/junit_test.gyp:junit_test_support',
+          ],
+          'variables': {
+            'main_class': 'org.chromium.testing.local.JunitTestMain',
+            'src_paths': [
+              'public/android/junit/',
+            ],
+          },
+          'includes': [
+            '../build/host_jar.gypi',
+          ],
+        },
       ],
     }],
     ['OS!="android" and OS!="ios" and OS!="linux"', {
       # npapi test plugin doesn't build on android or ios
       'targets': [
         {
           'target_name': 'npapi_test_plugin',
           'type': 'loadable_module',
           'variables': {
             'chromium_code': 1,
@@ skipping 128 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }