CrOS: Migrate ChromeOS memory/ folder to a new component.

The folder //chromeos/memory is growing larger and will
continue to do so. To help keep //chromeos clean we will
move it to a standalone component.

Bug: 1067833
Change-Id: I7931b4a649038212aa7b87d44479958f644ff668
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149947
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759293}

chrome/app/BUILD.gn

@@ -165,6 +165,7 @@ static_library("test_support") {
     deps += [
       "//chrome/browser/chromeos",
       "//chromeos",
+      "//chromeos/memory:memory",
     ]
   }
 

chromeos/BUILD.gn

@@ -42,31 +42,16 @@ component("chromeos") {
     ":chromeos_export",
     "//base",
     "//base:i18n",
-    "//base/util/memory_pressure",
     "//chromeos/dbus",
     "//chromeos/dbus/constants",
     "//components/policy/proto",
-    "//crypto",
-    "//crypto:platform",
     "//google_apis",
     "//services/network/public/cpp:cpp",
     "//third_party/protobuf:protobuf_lite",
-    "//third_party/zlib/google:compression_utils",
   ]
   sources = [
     "hugepage_text/hugepage_text.cc",
     "hugepage_text/hugepage_text.h",
-    "memory/kstaled.cc",
-    "memory/kstaled.h",
-    "memory/memory.cc",
-    "memory/memory.h",
-    "memory/pagemap.cc",
-    "memory/pagemap.h",
-    "memory/swap_configuration.cc",
-    "memory/swap_configuration.h",
-    "memory/userspace_swap/region.h",
-    "memory/userspace_swap/swap_storage.cc",
-    "memory/userspace_swap/swap_storage.h",
     "policy/weekly_time/time_utils.cc",
     "policy/weekly_time/time_utils.h",
     "policy/weekly_time/weekly_time.cc",
@@ -178,6 +163,7 @@ test("chromeos_unittests") {
     "//chromeos/login/auth:unit_tests",
     "//chromeos/login/login_state:unit_tests",
     "//chromeos/login/session:unit_tests",
+    "//chromeos/memory:unit_tests",
     "//chromeos/network:test_support",
     "//chromeos/network:unit_tests",
     "//chromeos/services:unit_tests",
@@ -205,8 +191,6 @@ test("chromeos_unittests") {
     "//url",
   ]
   sources = [
-    "memory/pagemap_unittest.cc",
-    "memory/userspace_swap/swap_storage_unittest.cc",
     "policy/weekly_time/time_utils_unittest.cc",
     "policy/weekly_time/weekly_time_interval_unittest.cc",
     "policy/weekly_time/weekly_time_unittest.cc",

chromeos/memory/BUILD.gn

+# Copyright 2020 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/buildflag_header.gni")
+import("//testing/test.gni")
+
+assert(is_chromeos, "Non-Chrome-OS builds must not depend on //chromeos")
+
+# Used by targets that compile into the implementation.
+config("chromeos_implementation") {
+  defines = [ "CHROMEOS_IMPLEMENTATION" ]
+}
+
+component("memory") {
+  configs += [
+    ":chromeos_implementation",
+    "//build/config/linux/nss:system_nss_no_ssl_config",
+  ]
+
+  public_deps = [ "//chromeos/constants" ]
+  deps = [
+    "//base",
+    "//base/util/memory_pressure",
+    "//chromeos:chromeos_export",
+    "//chromeos/dbus",
+    "//chromeos/dbus/constants",
+    "//crypto",
+    "//crypto:platform",
+    "//third_party/zlib/google:compression_utils",
+  ]
+  sources = [
+    "kstaled.cc",
+    "kstaled.h",
+    "memory.cc",
+    "memory.h",
+    "pagemap.cc",
+    "pagemap.h",
+    "swap_configuration.cc",
+    "swap_configuration.h",
+    "userspace_swap/region.h",
+    "userspace_swap/swap_storage.cc",
+    "userspace_swap/swap_storage.h",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  configs += [ "//build/config/linux/nss:system_nss_no_ssl_config" ]
+  deps = [
+    ":memory",
+    "//base/test:test_support",
+    "//chromeos:chromeos_buildflags",
+    "//mojo/core/embedder",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+  sources = [
+    "pagemap_unittest.cc",
+    "userspace_swap/swap_storage_unittest.cc",
+  ]
+}

components/arc/BUILD.gn

@@ -231,7 +231,6 @@ static_library("arc_base") {
   deps = [
     "//ash/public/cpp",
     "//base",
-    "//chromeos",
     "//chromeos/constants",
     "//chromeos/cryptohome",
     "//chromeos/dbus:common",
@@ -240,6 +239,7 @@ static_library("arc_base") {
     "//chromeos/dbus/session_manager",
     "//chromeos/dbus/session_manager:login_manager_proto",
     "//chromeos/dbus/upstart",
+    "//chromeos/memory:memory",
     "//chromeos/system:system",
     "//components/account_id",
     "//components/keyed_service/content",