[ios clean] ToolsMenu UI changes

ios/clean/chrome/browser/ui/presenters/menu_presentation_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.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
 #import "ios/clean/chrome/browser/ui/presenters/menu_presentation_controller.h"
 
@@ skipping 32 matching lines @@
       self.presentationFrame.size = menuSize;
       self.presentationFrame.origin = CGPointMake(
           (self.containerView.bounds.size.width - menuSize.width) / 2.0,
           (self.containerView.bounds.size.height - menuSize.height) / 2.0);
     }
   }
   return self.presentationFrame;
 }
 
 - (void)presentationTransitionWillBegin {
-  self.presentedView.layer.borderWidth = 1.0;
-  self.presentedView.layer.shadowRadius = 1.0;
-  self.presentedView.layer.borderColor = [UIColor blackColor].CGColor;
+  self.presentedView.layer.shadowRadius = 5.0f;
+  self.presentedView.layer.shadowOpacity = 0.4f;
+  self.presentedView.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
+  self.presentedView.layer.cornerRadius = 2.0f;
 
   self.dismissRecognizer =
       [[UITapGestureRecognizer alloc] initWithTarget:self
                                               action:@selector(tapToDismiss:)];
   [self.containerView addGestureRecognizer:self.dismissRecognizer];
 }
 
 #pragma mark - Private methods.
 
 - (void)tapToDismiss:(UIGestureRecognizer*)recognizer {
   [self.toolbarCommandHandler closeToolsMenu];
 }
 
 // Checks if the presenting view controller conforms to
 // MenuPresentationDelegate and, if so, sets that view controller as the
 // presentation delegate. This can't be done at init time, becuase the
 // presenting view controller may not have been determined by UIKit yet.
 - (void)updatePresentationDelegate {
   if ([self.presentingViewController
           conformsToProtocol:@protocol(MenuPresentationDelegate)]) {
     self.presentationDelegate = static_cast<id<MenuPresentationDelegate>>(
         self.presentingViewController);
   }
 }
 
 @end