Refactor the Android port to allow access to the chrome layer.

android_webview/native/webview_native.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,
+  },
+  'targets': [
+    {
+      'target_name': 'webview_native',
+      'type': 'static_library',
+      'dependencies': [
+        '../../base/base.gyp:base_static',
+        'android_webview_native_jni',
+      ],
+      'include_dirs': [
+        '../..',
+        '../../skia/config',
+        '<(SHARED_INTERMEDIATE_DIR)/android_webview',
+      ],
+      'sources': [
+        'android_webview_jni_registrar.cc',
+        'android_webview_jni_registrar.h',
+        'webview_web_contents_delegate_android.cc',
+        'webview_web_contents_delegate_android.h',
+      ],
+    },
+    {
+      'target_name': 'android_webview_native_jni',
+      'type': 'none',
+      'sources': [
+      ],
+      'variables': {
+        'jni_gen_dir': 'android_webview',
+      },
+      'includes': [ '../../build/jni_generator.gypi' ],
+    },
+  ],
+}