Upstream Chrome on iOS source code [1/11].

ios/chrome/app/main.mm

+// Copyright 2016 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.
+
+// ======                        New Architecture                         =====
+// =         This code is only used in the new iOS Chrome architecture.       =
+// ============================================================================
+
+#import <UIKit/UIKit.h>
+
+#include "base/at_exit.h"
+#include "base/debug/crash_logging.h"
+#include "components/crash/core/common/crash_keys.h"
+#include "ios/chrome/app/app_delegate.h"
+#include "ios/chrome/app/startup/ios_chrome_main.h"
+#include "ios/chrome/browser/crash_report/breakpad_helper.h"
+#include "ios/chrome/browser/crash_report/crash_keys.h"
+#include "ios/chrome/common/channel_info.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+
+void StartCrashController() {
+  std::string channel_string = GetChannelString();
+
+  RegisterChromeIOSCrashKeys();
+  base::debug::SetCrashKeyValue(crash_keys::kChannel, channel_string);
+  breakpad_helper::Start(channel_string);
+}
+
+}  // namespace
+
+int main(int argc, char* argv[]) {
+  // Create the AtExitManager for the application before the crash controller
+  // is started. This needs to be stack allocated and live for the lifetime of
+  // the app.
+  base::AtExitManager at_exit;
+
+  IOSChromeMain::InitStartTime();
+
+  // Pre-launch actions are in their own autorelease pool so they get cleaned
+  // up before the main app starts.
+  @autoreleasepool {
+    NSUserDefaults* standardDefaults = [NSUserDefaults standardUserDefaults];
+
+    // Set NSUserDefaults keys to force pseudo-RTL if needed.
+    if ([standardDefaults boolForKey:@"EnablePseudoRTL"]) {
+      NSDictionary* pseudoDict = @{ @"YES" : @"AppleTextDirection" };
+      [standardDefaults registerDefaults:pseudoDict];
+    }
+
+    // The crash controller is started here, even though the user may have opted
+    // out; it needs to start as soon as possible to catch crashes during app
+    // launch. Since user preferences aren't loaded yet, it isn't known if the
+    // user has opted out. Once the preferences are loaded, the crash
+    // controller is stopped for opted-out users, and any crash reports that
+    // are collected before then are not sent.
+    StartCrashController();
+
+    // Always ignore SIGPIPE.  Chrome should always check the return value of
+    // write() instead of relying on this signal.
+    CHECK_NE(SIG_ERR, signal(SIGPIPE, SIG_IGN));
+  }
+
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil,
+                             NSStringFromClass([AppDelegate class]));
+  }
+}