Turn on UseLibraryDependencyInputs for browser_tests to enable incremental linking.

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' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 946 matching lines @@
         '../ppapi/ppapi_internal.gyp:ppapi_tests',
         '../third_party/mesa/mesa.gyp:osmesa',
       ],
       'include_dirs': [
         '..',
         '<(SHARED_INTERMEDIATE_DIR)',
       ],
       'defines': [
         'HAS_OUT_OF_PROC_TEST_RUNNER',
       ],
+      'variables': {
+        'win_use_external_manifest': 1,

[scottmg, 2013/11/22 18:31:53]

this isn't enough to turn on incremental, you need the other block from here too

https://codereview.chromium.org/25377002/diff/1/chrome/chrome_tests.gypi

[jam, 2013/11/22 19:19:18]

ah!, maybe that'll help find other problems

+      },
       'sources': [
         '../apps/app_restore_service_browsertest.cc',
         '../apps/app_shim/app_shim_host_manager_browsertest_mac.mm',
         '../apps/app_shim/test/app_shim_host_manager_test_api_mac.cc',
         '../apps/app_shim/test/app_shim_host_manager_test_api_mac.h',
         '../apps/load_and_launch_browsertest.cc',
         # TODO(blundell): Bring up a components_browsertests target and move
         # this test to be in that target. crbug.com/283846
         '../components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc',
         '../components/autofill/content/renderer/test_password_autofill_agent.h',
@@ skipping 116 matching lines @@
         'browser/crash_recovery_browsertest.cc',
         'browser/custom_handlers/protocol_handler_registry_browsertest.cc',
         'browser/devtools/adb_client_socket_browsertest.cc',
         'browser/devtools/devtools_adb_bridge_browsertest.cc',
         'browser/devtools/devtools_sanity_browsertest.cc',
         'browser/do_not_track_browsertest.cc',
         'browser/download/download_browsertest.cc',
         'browser/download/download_danger_prompt_browsertest.cc',
         'browser/download/download_started_animation_browsertest.cc',
         'browser/download/save_page_browsertest.cc',
-        'browser/drive/fake_drive_service.cc',
-        'browser/drive/fake_drive_service.h',
         'browser/errorpage_browsertest.cc',
         'browser/extensions/active_tab_apitest.cc',
         'browser/extensions/activity_log/activity_log_browsertest.cc',
         'browser/extensions/activity_log/uma_policy_browsertest.cc',
         'browser/extensions/alert_apitest.cc',
         'browser/extensions/all_urls_apitest.cc',
         'browser/extensions/api/activity_log_private/activity_log_private_apitest.cc',
         'browser/extensions/api/app_window/app_window_apitest.cc',
         'browser/extensions/api/audio/audio_apitest.cc',
         'browser/extensions/api/autotest_private/autotest_private_apitest.cc',
@@ skipping 1943 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }