Sync: Generalize entity injection in Android tests

sync/sync_tests.gypi

 # Copyright 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.
 
 {
   'targets': [
     # Test support files for the 'sync_core' target.
     # GN version: //sync:test_support_sync_core
     {
       'target_name': 'test_support_sync_core',
@@ skipping 451 matching lines @@
           'sources': [
             '../chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java',
           ],
           'variables': {
             'jni_gen_package': 'sync/test/fake_server',
             'jni_generator_ptr_type': 'long',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
         {
+          # TODO(pvalenzuela): Create GN version of this target.
+          # http://crbug.com/475612
+          'target_name': 'test_support_sync_proto_java',
+          'type': 'none',
+          'variables': {
+            'proto_in_dir': '<(INTERMEDIATE_DIR)/sync_protos',
+            # Set this variable so that sync_proto_source_paths refers to the
+            # temporary proto definitions created here.
+            'sync_proto_sources_dir': '<(INTERMEDIATE_DIR)/sync_protos',
+          },
+          'actions': [
+            {
+              'action_name': 'run_script',
+              'inputs': [
+                'protocol/prepare_protos_for_java_tests.py',
+                # Use the original list of proto files (defined in sync.gyp).
+                '<@(sync_proto_sources)',
+              ],
+              'outputs': [
+                '<@(sync_proto_source_paths)',
+              ],
+              'action': [
+                'python',
+                'protocol/prepare_protos_for_java_tests.py',
+                '--output_dir',
+                '<(INTERMEDIATE_DIR)/sync_protos',
+                # Use the original list of proto files (defined in sync.gyp).
+                '<@(sync_proto_sources)'
+              ],
+            },
+          ],
+          'sources': [
+            '<@(sync_proto_source_paths)',
+          ],
+          'includes': ['protocol/protocol.gypi', '../build/protoc_java.gypi'],
+        },
+        {
           # GN: //sync:test_support_sync_fake_server_android
           'target_name': 'test_support_sync_fake_server_android',
           'type': 'static_library',
           'dependencies': [
             'sync_fake_server_jni_headers',
             'test_support_sync_fake_server',
             '../testing/gtest.gyp:gtest',
             '../base/base.gyp:base',
           ],
           'export_dependent_settings': [
@@ skipping 13 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'sync_unit_tests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }