Lacros: Ensure that the correct code is generated for lacros.

The change is in preparating to switching lacros-chrome from
target_os="linux" to target_os="chromeos". Since currently
lacros-chromes uses linux chrome's policy, we want to keep the behaviour
for now after the target_os switch.

Bug: 1052397
Change-Id: I0fd045f5bd0dc5524147545875b0446fd75dfca8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636100
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Reviewed-by: Igor <igorcov@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845992}

components/policy/BUILD.gn

@@ -125,7 +125,6 @@ python2_action("policy_code_generate") {
   args = [
     # Input information
     "--chrome-version-file=" + chrome_version_path,
-    "--target-platform=" + target_os,
     "--policy-templates-file=" +
         rebase_path("resources/policy_templates.json", root_build_dir),
 
@@ -142,6 +141,14 @@ python2_action("policy_code_generate") {
         rebase_path(app_restrictions_path, root_build_dir),
     "--risk-tag-header=" + rebase_path(risk_tag_header_path, root_build_dir),
   ]
+
+  #TODO(crbug.com/1169547): Switch lacros-chrome to chromeos policy.
+  if (is_chromeos_lacros) {
+    # Currently lacros-chrome uses linux's policy instead of chromeos policy.
+    args += [ "--target-platform=linux" ]
+  } else {
+    args += [ "--target-platform=" + target_os ]
+  }
 }
 
 # TODO(crbug.com/1112471): Get this to run cleanly under Python 3.
@@ -178,6 +185,14 @@ python2_action("full_runtime_code_generate") {
         rebase_path(policy_common_definitions_full_runtime_proto_path,
                     root_build_dir),
   ]
+
+  #TODO(crbug.com/1169547): Switch lacros-chrome to chromeos policy.
+  if (is_chromeos_lacros) {
+    # Currently lacros-chrome uses linux's policy instead of chromeos policy.
+    args += [ "--target-platform=linux" ]
+  } else {
+    args += [ "--target-platform=" + target_os ]
+  }
 }
 
 policy_templates_grd_file = "resources/policy_templates.grd"
@@ -376,7 +391,10 @@ static_library("generated") {
     "//components/policy/proto:policy_common_definitions_compile_proto",
     "//third_party/protobuf:protobuf_lite",
   ]
-  deps = [ "//build:branding_buildflags" ]
+  deps = [
+    "//build:branding_buildflags",
+    "//build:chromeos_buildflags",
+  ]
 }
 
 if (gen_policy_templates_android && is_android) {

components/policy/tools/generate_policy_source.py

@@ -477,6 +477,7 @@ def _WritePolicyConstantHeader(policies, policy_atomic_groups, target_platform,
           '#include <string>\n'
           '\n'
           '#include "base/values.h"\n'
+          '#include "build/chromeos_buildflags.h"\n'
           '#include "components/policy/core/common/policy_details.h"\n'
           '#include "components/policy/core/common/policy_map.h"\n'
           '#include "components/policy/proto/cloud_policy.pb.h"\n'
@@ -492,7 +493,7 @@ def _WritePolicyConstantHeader(policies, policy_atomic_groups, target_platform,
             'configuration resides.\n'
             'extern const wchar_t kRegistryChromePolicyKey[];\n')
 
-  f.write('#if defined (OS_CHROMEOS)\n'
+  f.write('#if BUILDFLAG(IS_CHROMEOS_ASH)\n'
           '// Sets default values for enterprise users.\n'
           'void SetEnterpriseUsersDefaults(PolicyMap* policy_map);\n'
           '#endif\n'
@@ -1127,7 +1128,7 @@ namespace policy {
           '  return &kChromeSchemaData;\n'
           '}\n\n')
 
-  f.write('#if defined (OS_CHROMEOS)\n'
+  f.write('#if BUILDFLAG(IS_CHROMEOS_ASH)\n'
           'void SetEnterpriseUsersDefaults(PolicyMap* policy_map) {\n')
 
   for policy in policies: