[ios] Adds ChromiumBrowserProvider.

ios/chrome/browser/providers/chromium_logo_controller.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.
+
+#import "ios/chrome/browser/providers/chromium_logo_controller.h"
+
+#import <UIKit/UIKit.h>
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation ChromiumLogoController
+
+@synthesize showingLogo = _showingLogo;
+@synthesize view = _view;
+
+- (instancetype)init {
+  if ((self = [super init])) {
+    _view = [[UIView alloc] init];
+  }
+  return self;
+}
+
+- (void)fetchDoodle {
+  // Do nothing.
+}
+
+- (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
+  return nil;
+}
+
+@end