[ios] Adds LocationBarCoordinator.

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

+// 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_view_controller.h"
+
+#import "ios/chrome/browser/ui/omnibox/omnibox_text_field_ios.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface LocationBarViewController ()
+@property(nonatomic, readwrite, strong) OmniboxTextFieldIOS* omnibox;
+@end
+
+@implementation LocationBarViewController
+
+@synthesize omnibox = _omnibox;
+
+- (instancetype)init {
+  if ((self = [super init])) {
+    UIColor* textColor = [UIColor blackColor];
+    UIColor* tintColor = nil;
+    _omnibox =
+        [[OmniboxTextFieldIOS alloc] initWithFrame:CGRectZero
+                                              font:[UIFont systemFontOfSize:14]
+                                         textColor:textColor
+                                         tintColor:tintColor];
+  }
+  return self;
+}
+
+- (void)loadView {
+  self.view = [[UIView alloc] initWithFrame:CGRectZero];

[marq (ping after 24h), 2017/04/05 14:59:11]

Add a comment indicating why this is needed instead of the default -loadView.

[rohitrao (ping after 24h), 2017/04/05 15:17:09]

I didn't know we got a plain old UIView by default.  This is not needed,
removed.

+}
+
+- (void)viewDidLoad {
+  self.omnibox.autoresizingMask =
+      UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+  self.omnibox.frame = self.view.bounds;
+  [self.view addSubview:self.omnibox];
+}
+
+@end