Enable NativeActivity based Android tests.

testing/android/native_test.gyp

Index: testing/android/native_test.gyp
diff --git a/testing/android/native_test.gyp b/testing/android/native_test.gyp
index b6fed8623aeb98e7934dc8606f4c249f9ce0b40a..4e4511e101b7309d27eb8eb7b6c8b876ca1abc7b 100644
--- a/testing/android/native_test.gyp
+++ b/testing/android/native_test.gyp
@@ -7,11 +7,24 @@
     ['OS=="android"', {
       'targets': [
         {
+          'target_name': 'native_test_activity',
+          'type': 'none',
+          'variables': {
+            'jinja_inputs': [ 'native_test/java/src/org/chromium/native_test/NativeTestActivity.java.jinja2' ],
+            'jinja_output': '<(SHARED_INTERMEDIATE_DIR)/native_test_activity/java/src/org/chromium/native_test/NativeTestActivity.java',
+            'jinja_variables': [ 'use_native_activity="false"', ],
+          },
+          'includes': [ '../../build/android/jinja_template.gypi' ],
+        },
+        {
           # GN: //testing/android:native_test_jni_headers
           'target_name': 'native_test_jni_headers',
           'type': 'none',
+          'dependencies': [
+            'native_test_activity',
+          ],
           'sources': [
-            'native_test/java/src/org/chromium/native_test/NativeTestActivity.java'
+            '<(SHARED_INTERMEDIATE_DIR)/native_test_activity/java/src/org/chromium/native_test/NativeTestActivity.java'
           ],
           'variables': {
             'jni_gen_package': 'testing',
@@ -59,11 +72,13 @@
             'on_device_instrumentation.gyp:reporter_java',
             '../../base/base.gyp:base_native_libraries_gen',
             '../../base/base.gyp:base_java',
+            'native_test_activity',
           ],
           'variables': {
             'chromium_code': '1',
             'jar_excluded_classes': [ '*/NativeLibraries.class' ],
             'java_in_dir': 'native_test/java',
+            'generated_src_dirs': [ '<(SHARED_INTERMEDIATE_DIR)/native_test_activity', ],
           },
           'includes': [ '../../build/java.gypi' ],
         },