[ios] Adds LocationBarCoordinator.

ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.mm

Index: ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.mm b/ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.mm
new file mode 100644
index 0000000000000000000000000000000000000000..e885b4ff1ba446e51768280b5d94a31318c13112
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.mm
@@ -0,0 +1,54 @@
+// Copyright 2017 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 "ios/clean/chrome/browser/ui/omnibox/location_bar_coordinator.h"
+
+#include "base/memory/ptr_util.h"
+#import "ios/chrome/browser/ui/omnibox/location_bar_controller_impl.h"
+#include "ios/chrome/browser/ui/toolbar/toolbar_model_ios.h"
+#import "ios/clean/chrome/browser/ui/omnibox/location_bar_mediator.h"
+#import "ios/clean/chrome/browser/ui/omnibox/location_bar_view_controller.h"
+#import "ios/shared/chrome/browser/ui/browser_list/browser.h"
+#import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface LocationBarCoordinator ()
+
+@property(nonatomic, readwrite, strong) LocationBarMediator* mediator;

[marq (ping after 24h), 2017/04/05 09:07:18]

No need for readwrite, since this isn't a redeclaration.

[rohitrao (ping after 24h), 2017/04/05 14:37:04]

Removed, but I've always preferred to leave it in, because that way I never have
to think about what the default is.

+@property(nonatomic, readwrite, strong)
+    LocationBarViewController* viewController;
+
+@end
+
+@implementation LocationBarCoordinator {
+}
+
+@synthesize mediator = _mediator;
+@synthesize viewController = _viewController;
+
+- (void)start {
+  DCHECK(self.parentCoordinator);
+  self.viewController = [[LocationBarViewController alloc] init];
+
+  Browser* browser = self.browser;
+
+  _mediator = [[LocationBarMediator alloc]
+      initWithWebStateList:&(browser->web_state_list())];
+  std::unique_ptr<LocationBarController> locationBar =
+      base::MakeUnique<LocationBarControllerImpl>(self.viewController.omnibox,
+                                                  browser->browser_state(), nil,

[marq (ping after 24h), 2017/04/05 09:07:18]

Add comments to nil params so it's obvious what they are without looking at the
LocationBarControllerImpl header -- "nil /* preloaded */", etc.

[rohitrao (ping after 24h), 2017/04/05 14:37:04]

Done.

+                                                  nil, _mediator);
+  [_mediator setLocationBar:std::move(locationBar)];
+  [super start];
+}
+
+- (void)stop {
+  [super stop];
+  self.viewController = nil;
+}
+
+@end