OSCrypt supports encryption with KWallet

components/os_crypt/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/features.gni")
 import("//build/config/ui.gni")
 
 static_library("os_crypt") {
   sources = [
     "ie7_password_win.cc",
@@ skipping 48 matching lines @@
         "key_storage_libsecret.h",
         "libsecret_util_linux.cc",
         "libsecret_util_linux.h",
       ]
       configs += [ "//build/config/linux:glib" ]
       deps += [ "//third_party/libsecret" ]
       defines += [ "USE_LIBSECRET" ]
     }
     if (use_dbus) {
       sources += [
+        "key_storage_kwallet.cc",
+        "key_storage_kwallet.h",
         "kwallet_dbus.cc",
         "kwallet_dbus.h",
       ]
       deps += [ "//dbus" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "os_crypt_mocker.cc",
     "os_crypt_mocker.h",
   ]
   deps = [
     ":os_crypt",
     "//base",
     "//testing/gtest",
   ]
   if (is_desktop_linux) {
     sources += [
       "os_crypt_mocker_linux.cc",
       "os_crypt_mocker_linux.h",
     ]
-    deps += [ "//third_party/libsecret" ]
-    defines = [ "USE_LIBSECRET" ]
+    defines = []
+    if (use_glib) {
+      defines += [ "USE_LIBSECRET" ]
+    }
+    if (use_dbus) {
+      defines += [ "USE_KWALLET" ]
+    }
   }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "ie7_password_win_unittest.cc",
     "keychain_password_mac_unittest.mm",
     "os_crypt_unittest.cc",
   ]
   deps = [
     ":os_crypt",
     ":test_support",
     "//base",
     "//crypto",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_desktop_linux) {
     sources += [ "os_crypt_linux_unittest.cc" ]
     defines = []
 
     if (use_glib) {
       sources += [ "os_crypt_util_linux_unittest.cc" ]
       deps += [ "//third_party/libsecret" ]
       defines += [ "USE_LIBSECRET" ]
     }
     if (use_dbus) {
-      sources += [ "kwallet_dbus_unittest.cc" ]
+      sources += [
+        "key_storage_kwallet_unittest.cc",
+        "kwallet_dbus_unittest.cc",
+      ]
       deps += [ "//dbus:test_support" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }