The Java Client should be aware of the readback status.

content/content.gyp

 # Copyright (c) 2012 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': {
     'chromium_code': 1,  # Use higher warning level.
     'chromium_enable_vtune_jit_for_v8%': 0,  # enable the vtune support for V8 engine.
     'directxsdk_exists': '<!pymod_do_main(dir_exists ../third_party/directxsdk)',
   },
@@ skipping 428 matching lines @@
             '../third_party/WebKit/public/blink_headers.gyp:blink_headers_java',
             'common_aidl',
             'console_message_level_java',
             'content_common',
             'content_strings_grd',
             'content_gamepad_mapping',
             'gesture_event_type_java',
             'navigation_controller_java',
             'popup_item_type_java',
             'result_codes_java',
+            'readback_response_java',
             'speech_recognition_error_java',
             'top_controls_state_java',
             'screen_orientation_values_java',
           ],
           'variables': {
             'java_in_dir': '../content/public/android/java',
             'has_java_resources': 1,
             'R_package': 'org.chromium.content',
             'R_package_relpath': 'org/chromium/content',
           },
@@ skipping 45 matching lines @@
         },
         {
           'target_name': 'popup_item_type_java',
           'type': 'none',
           'variables': {
             'source_file': 'browser/android/content_view_core_impl.cc',
           },
           'includes': [ '../build/android/java_cpp_enum.gypi' ],
         },
         {
+          'target_name': 'readback_response_java',
+          'type': 'none',
+          'variables': {
+            'source_file': 'public/browser/readback_types.h',
+          },
+          'includes': [ '../build/android/java_cpp_enum.gypi' ],
+        },
+        {
           'target_name': 'result_codes_java',
           'type': 'none',
           'variables': {
             'source_file': 'public/common/result_codes.h',
           },
           'includes': [ '../build/android/java_cpp_enum.gypi' ],
         },
         {
           'target_name': 'speech_recognition_error_java',
           'type': 'none',
@@ skipping 75 matching lines @@
                   ],
                 },
               ],
             }],
           ],
         },
       ],
     }],  # OS == "android"
   ],
 }