[Android] Create buildable browser_tests gn target for android.

chrome/chrome_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.
 {
   'variables': {
     'build_angle_deqp_tests%': 0,
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
@@ skipping 25 matching lines @@
       '../extensions/browser/guest_view/extension_options/extension_options_apitest.cc',
       '../extensions/browser/guest_view/mime_handler_view/mime_handler_view_browsertest.cc',
       '../extensions/renderer/console_apitest.cc',
       '../extensions/renderer/script_context_browsertest.cc'
     ],
     'chrome_browser_tests_display_source_apitest': [
       '../extensions/browser/api/display_source/display_source_apitestbase.cc',
       '../extensions/browser/api/display_source/display_source_apitestbase.h',
       'browser/extensions/api/display_source/display_source_wifi_display_apitest.cc',
     ],
     'chrome_browser_tests_sources': [

[sky, 2016/07/06 16:00:51]

Please add a comment as to why this is empty. Anyone casually looking at this
file may be inclined to remove the section without realizing somethings are
going to move to it.

[jbudorick, 2016/07/07 14:58:32]

Done.

+    ],
+    'chrome_browser_tests_desktop_only_sources': [
       # The list of sources which is only used by chrome browser tests.
       '../apps/app_restore_service_browsertest.cc',
       '../apps/load_and_launch_browsertest.cc',
       'app/chrome_command_ids.h',
       'app/chrome_dll.rc',
       'app/chrome_dll_resource.h',
       'app/chrome_version.rc.version',
       'browser/accessibility/browser_accessibility_state_browsertest.cc',
       'browser/app_controller_mac_browsertest.mm',
       'browser/apps/app_browsertest.cc',
@@ skipping 2171 matching lines @@
         '../third_party/widevine/cdm/widevine_cdm.gyp:widevine_test_license_server',
       ],
       'include_dirs': [
         '..',
         '<(SHARED_INTERMEDIATE_DIR)',
       ],
       'defines': [
         'HAS_OUT_OF_PROC_TEST_RUNNER',
       ],
       'sources': [
+        '<@(chrome_browser_tests_desktop_only_sources)',
         '<@(chrome_browser_tests_extensions_sources)',
         '<@(chrome_browser_tests_sources)',
         '<@(chrome_browser_tests_webui_js_sources)',
         '<@(chrome_browser_extensions_test_support_sources)',
         'test/base/browser_tests_main.cc',
       ],
       'rules': [
         {
           'rule_name': 'js2webui',
           'extension': 'js',
@@ skipping 1341 matching lines @@
             'browser',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
           ],
         }]
     }],
   ],  # 'conditions'
 }