Animate IOS Share extension button.

ios/chrome/share_extension/share_view_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 <MobileCoreServices/MobileCoreServices.h>
 
 #import "ios/chrome/share_extension/share_view_controller.h"
 
 #import "base/ios/block_types.h"
 #import "base/mac/foundation_util.h"
@@ skipping 10 matching lines @@
 using ItemBlock = void (^)(id idResponse, NSError* error);
 
 namespace {
 
 // Minimum size around the widget
 const CGFloat kShareExtensionMargin = 15;
 const CGFloat kShareExtensionMaxWidth = 390;
 // Clip the last separator out of the table view.
 const CGFloat kScreenShotWidth = 100;
 const CGFloat kScreenShotHeight = 100;
-const CGFloat kAnimationDuration = 0.3;
 const CGFloat kMediumAlpha = 0.5;
 
 }  // namespace
 
 @interface ShareViewController ()<ShareExtensionViewActionTarget> {
   // This constrains the center of the widget to be vertically in the center
   // of the the screen. It has to be modified for the appearance and dismissal
   // animation.
   NSLayoutConstraint* _widgetVerticalPlacementConstraint;
 
@@ skipping 81 matching lines @@
   if (_image) {
     [self.shareView setScreenshot:_image];
   }
   dispatch_async(dispatch_get_main_queue(), ^{
     // Center the widget.
     [_widgetVerticalPlacementConstraint setActive:NO];
     _widgetVerticalPlacementConstraint = [_shareView.centerYAnchor
         constraintEqualToAnchor:self.view.centerYAnchor];
     [_widgetVerticalPlacementConstraint setActive:YES];
     [self.maskView setAlpha:0];
-    [UIView animateWithDuration:kAnimationDuration
+    [UIView animateWithDuration:ui_util::kAnimationDuration
                      animations:^{
                        [self.maskView setAlpha:1];
                        [self.view layoutIfNeeded];
                      }];
   });
 }
 
 - (void)displayErrorView {
   NSString* errorMessage =
       NSLocalizedString(@"IDS_IOS_ERROR_MESSAGE_SHARE_EXTENSION",
@@ skipping 103 matching lines @@
   // The direction (up or down) is relative to the output (cancel or submit).
   [_widgetVerticalPlacementConstraint setActive:NO];
   if (item) {
     _widgetVerticalPlacementConstraint =
         [_shareView.bottomAnchor constraintEqualToAnchor:self.view.topAnchor];
   } else {
     _widgetVerticalPlacementConstraint =
         [_shareView.topAnchor constraintEqualToAnchor:self.view.bottomAnchor];
   }
   [_widgetVerticalPlacementConstraint setActive:YES];
-  [UIView animateWithDuration:kAnimationDuration
+  [UIView animateWithDuration:ui_util::kAnimationDuration
       animations:^{
         [self.maskView setAlpha:0];
         [self.view layoutIfNeeded];
       }
       completion:^(BOOL finished) {
         NSArray* returnItem = item ? @[ item ] : @[];
         [self.extensionContext completeRequestReturningItems:returnItem
                                            completionHandler:nil];
       }];
 }
@@ skipping 75 matching lines @@
                   [self dismissAndReturnItem:_shareItem];
                 }];
 }
 
 - (void)shareExtensionView:(id)sender
                typeChanged:(app_group::ShareExtensionItemType)type {
   [self setItemType:type];
 }
 
 @end