Workaround java.gypi inclusion error in Chromium builds.

webrtc/api/api_java.gyp

+# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# This file exists only because there's no other way to avoid errors in the
+# Chromium build due to the inclusion of build/java.gypi. GYP unfortunately
+# processes all 'includes' for all .gyp files, ignoring conditions. This
+# processing takes place early in the cycle, before it's possible to use
+# variables. It will go away when WebRTC has fully migrated to GN.
+
+{
+  'includes': [ '../build/common.gypi', ],
+  'conditions': [
+    ['OS=="android"', {
+      'targets': [
+        {
+          # |libjingle_peerconnection_java| builds a jar file with name
+          # libjingle_peerconnection_java.jar using Chrome's build system.
+          # It includes all Java files needed to setup a PeeerConnection call
+          # from Android.
+          'target_name': 'libjingle_peerconnection_java',
+          'type': 'none',
+          'dependencies': [
+            '<(webrtc_root)/api/api.gyp:libjingle_peerconnection_so',
+          ],
+          'variables': {
+            # Designate as Chromium code and point to our lint settings to
+            # enable linting of the WebRTC code (this is the only way to make
+            # lint_action invoke the Android linter).
+            'android_manifest_path': '<(webrtc_root)/build/android/AndroidManifest.xml',
+            'suppressions_file': '<(webrtc_root)/build/android/suppressions.xml',
+            'chromium_code': 1,
+            'java_in_dir': 'java',
+            'webrtc_base_dir': '<(webrtc_root)/base',
+            'webrtc_modules_dir': '<(webrtc_root)/modules',
+            'additional_src_dirs' : [
+              'java/android',
+              '<(webrtc_base_dir)/java/src',
+              '<(webrtc_modules_dir)/audio_device/android/java/src',
+
+            ],
+          },
+          'includes': ['../../build/java.gypi'],
+        },
+      ],  # targets
+    }],  # OS=="android"
+  ],  # conditions
+}