Use Sync FakeServer in Android tests via custom APK

sync/sync_tests.gypi

Index: sync/sync_tests.gypi
diff --git a/sync/sync_tests.gypi b/sync/sync_tests.gypi
index b7b68c32192714664cc8e543571209d266b32f87..4501043e7dc893e17d7f5091e4051f7af5a9f4f3 100644
--- a/sync/sync_tests.gypi
+++ b/sync/sync_tests.gypi
@@ -449,6 +449,31 @@
           ],
           'includes': [ '../build/java.gypi' ],
         },
+        {
+          'target_name': 'sync_fake_server_jni_headers',
+          'type': 'none',
+          'sources': [
+            '../sync/test/android/javatests/src/org/chromium/sync/test/util/FakeServerHelper.java',
+          ],
+          'variables': {
+            'jni_gen_package': 'sync/test/fake_server',
+            'jni_generator_ptr_type': 'long',
+          },
+          'includes': [ '../build/jni_generator.gypi' ],
+        },
+        {
+          'target_name': 'test_support_sync_fake_server_android',
+          'type': 'static_library',
+          'dependencies': [
+            'sync_fake_server_jni_headers',
+            'test_support_sync_fake_server',
+            '../base/base.gyp:base',
+          ],
+          'sources': [
+            'test/fake_server/android/fake_server_helper_android.cc',
+            'test/fake_server/android/fake_server_helper_android.h',
+          ],
+        },
       ],
     }],
     ['OS == "android"', {