Add LargeIconCache and LargeIconServiceFactory for iOS.

ios/chrome/browser/ui/uikit_ui_util.mm

 // Copyright 2012 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/ui/uikit_ui_util.h"
 
 #import <Accelerate/Accelerate.h>
 #import <Foundation/Foundation.h>
 #import <QuartzCore/QuartzCore.h>
 #import <UIKit/UIKit.h>
@@ skipping 518 matching lines @@
   return IsCompact(keyWindow);
 }
 
 bool IsCompactTablet(id<UITraitEnvironment> environment) {
   return IsIPadIdiom() && IsCompact(environment);
 }
 
 bool IsCompactTablet() {
   return IsIPadIdiom() && IsCompact();
 }
+
+UIColor* ColorFromSkColor(SkColor color, CGFloat alpha) {
+  return [UIColor colorWithRed:SkColorGetR(color) / 255.0f
+                         green:SkColorGetG(color) / 255.0f
+                          blue:SkColorGetB(color) / 255.0f
+                         alpha:alpha];
+}