Compile FileCache related files only on Chrome OS.

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 437 matching lines @@
       "//chrome/common/extensions/api:api_registration",
       "//components/drive:drive",
       "//components/proximity_auth/ble",
       "//components/proximity_auth/cryptauth",
       "//extensions/components/javascript_dialog_extensions_client",
       "//media/cast:net",
     ]
     sources += rebase_path(gypi_values.chrome_browser_extensions_sources,
                            ".",
                            "//chrome")
+    if (is_chromeos) {
+      deps += [ "//components/drive:drive_chromeos" ]

[hashimoto, 2016/01/22 05:39:22]

Isn't it better to put this in chrome/browser/chromeos/BUILD.gn?

[yawano, 2016/01/22 06:18:59]

Done.

+    }
   }
   if (enable_background) {
     sources += rebase_path(gypi_values.chrome_browser_background_sources,
                            ".",
                            "//chrome")
     if (!use_aura || is_win || is_chromeos) {
       sources -= [ "background/background_mode_manager_aura.cc" ]
     }
   }
   if (enable_task_manager) {
@@ skipping 808 matching lines @@
       "extensions/test_extension_service.h",
       "extensions/test_extension_system.cc",
       "extensions/test_extension_system.h",
       "media_galleries/media_galleries_test_util.cc",
       "media_galleries/media_galleries_test_util.h",
     ]
     deps += [
       "//components/drive:test_support",
       "//components/storage_monitor:test_support",
     ]
+
+    if (is_chromeos) {
+      deps += [ "//components/drive:test_support_chromeos" ]
+    }
   }
 
   if (enable_mdns) {
     sources += [
       "local_discovery/test_service_discovery_client.cc",
       "local_discovery/test_service_discovery_client.h",
     ]
   }
 
   if (enable_app_list) {
@@ skipping 38 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }