lacros: Introduce ChromeBrowserMainPartsLacros

I need to introduce it so I have a place to put some crash and metrics
consent code that needs to run early in browser startup.

No functional changes.

Bug: 1148604
Change-Id: I9dca170b1cf9f0453e174d7cbe0a0b8652f7328b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508367Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828773}

chrome/browser/BUILD.gn

@@ -4501,6 +4501,8 @@ static_library("browser") {
   if (is_lacros) {
     assert(enable_native_notifications)
     sources += [
+      "chrome_browser_main_parts_lacros.cc",
+      "chrome_browser_main_parts_lacros.h",
       "feedback/show_feedback_page_lacros.cc",
       "first_run/first_run_internal_lacros.cc",
       "lacros/account_manager_facade_factory_lacros.cc",

chrome/browser/OWNERS

@@ -17,6 +17,8 @@ per-file *.xtb=file://tools/translation/TRANSLATION_OWNERS
 per-file *_android.*=file://chrome/browser/android/OWNERS
 per-file *.java=file://chrome/browser/android/OWNERS
 
+per-file *_lacros*=file://chrome/browser/lacros/OWNERS
+
 per-file browser_resources.grd=file://ui/webui/PLATFORM_OWNERS
 per-file dev_ui_browser_resources.grd=file://ui/webui/PLATFORM_OWNERS
 

chrome/browser/chrome_browser_main_parts_lacros.cc

+// 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.
+
+#include "chrome/browser/chrome_browser_main_parts_lacros.h"
+
+#include "base/check.h"
+#include "chrome/browser/browser_process.h"
+#include "content/public/common/result_codes.h"
+
+ChromeBrowserMainPartsLacros::ChromeBrowserMainPartsLacros(
+    const content::MainFunctionParams& parameters,
+    StartupData* startup_data)
+    : ChromeBrowserMainPartsLinux(parameters, startup_data) {}
+
+ChromeBrowserMainPartsLacros::~ChromeBrowserMainPartsLacros() = default;
+
+int ChromeBrowserMainPartsLacros::PreEarlyInitialization() {
+  int result = ChromeBrowserMainPartsLinux::PreEarlyInitialization();
+  if (result != content::RESULT_CODE_NORMAL_EXIT)
+    return result;
+
+  DCHECK(g_browser_process->local_state());
+  // TODO(https://crbug.com/1148604): Inherit metrics consent from ash. Do it
+  // here because local state is required to check for policy overrides.
+
+  return content::RESULT_CODE_NORMAL_EXIT;
+}

chrome/browser/chrome_browser_main_parts_lacros.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_PARTS_LACROS_H_
+#define CHROME_BROWSER_CHROME_BROWSER_MAIN_PARTS_LACROS_H_
+
+#include "chrome/browser/chrome_browser_main_linux.h"
+
+// Startup and shutdown code for Lacros. See ChromeBrowserMainParts for details.
+class ChromeBrowserMainPartsLacros : public ChromeBrowserMainPartsLinux {
+ public:
+  ChromeBrowserMainPartsLacros(const content::MainFunctionParams& parameters,
+                               StartupData* startup_data);
+  ChromeBrowserMainPartsLacros(const ChromeBrowserMainPartsLacros&) = delete;
+  ChromeBrowserMainPartsLacros& operator=(const ChromeBrowserMainPartsLacros&) =
+      delete;
+  ~ChromeBrowserMainPartsLacros() override;
+
+  // ChromeBrowserMainParts:
+  int PreEarlyInitialization() override;
+};
+
+#endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_PARTS_LACROS_H_

chrome/browser/chrome_content_browser_client.cc

@@ -647,6 +647,7 @@
 #endif
 
 #if BUILDFLAG(IS_LACROS)
+#include "chrome/browser/chrome_browser_main_parts_lacros.h"
 #include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views_lacros.h"
 #include "chromeos/lacros/lacros_chrome_service_impl.h"
 #endif
@@ -1374,9 +1375,12 @@ ChromeContentBrowserClient::CreateBrowserMainParts(
 #elif defined(OS_MAC)
   main_parts =
       std::make_unique<ChromeBrowserMainPartsMac>(parameters, &startup_data_);
-#elif defined(OS_CHROMEOS)
+#elif BUILDFLAG(IS_CHROMEOS_ASH)
   main_parts = std::make_unique<chromeos::ChromeBrowserMainPartsChromeos>(
       parameters, &startup_data_);
+#elif BUILDFLAG(IS_CHROMEOS_LACROS)
+  main_parts = std::make_unique<ChromeBrowserMainPartsLacros>(parameters,
+                                                              &startup_data_);
 #elif defined(OS_LINUX)
   main_parts =
       std::make_unique<ChromeBrowserMainPartsLinux>(parameters, &startup_data_);