Revert of Removing "All Bookmarks"

ios/chrome/browser/ui/bookmarks/bookmark_position_cache.mm

 // Copyright 2014 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/bookmarks/bookmark_position_cache.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/mac/objc_property_releaser.h"
@@ skipping 25 matching lines @@
 
 @end
 
 @implementation BookmarkPositionCache
 @synthesize folderId = _folderId;
 @synthesize position = _position;
 @synthesize type = _type;
 
 #pragma mark - Public Constructors
 
++ (BookmarkPositionCache*)cacheForMenuItemAllWithPosition:(CGFloat)position {
+  return [[[BookmarkPositionCache alloc]
+      initWithFolderId:0
+              position:position
+                  type:bookmarks::MenuItemAll] autorelease];
+}
+
 + (BookmarkPositionCache*)cacheForMenuItemFolderWithPosition:(CGFloat)position
                                                     folderId:(int64_t)folderId {
   return [[[BookmarkPositionCache alloc]
       initWithFolderId:folderId
               position:position
                   type:bookmarks::MenuItemFolder] autorelease];
 }
 
 #pragma mark - Designated Initializer
 
@@ skipping 21 matching lines @@
     return YES;
   if (![object isKindOfClass:[BookmarkPositionCache class]])
     return NO;
   BookmarkPositionCache* other = static_cast<BookmarkPositionCache*>(object);
   if (self.type != other.type)
     return NO;
   if (fabs(self.position - other.position) > 0.01)
     return NO;
   switch (self.type) {
     case bookmarks::MenuItemDivider:
+    case bookmarks::MenuItemAll:
     case bookmarks::MenuItemSectionHeader:
       return YES;
     case bookmarks::MenuItemFolder:
       return self.folderId == other.folderId;
   }
 }
 
 - (NSUInteger)hash {
   return static_cast<NSUInteger>(self.type) ^
          static_cast<NSUInteger>(self.folderId);
@@ skipping 27 matching lines @@
 }
 
 - (void)encodeWithCoder:(NSCoder*)coder {
   [coder encodeInt:kVersion forKey:kVersionKey];
   [coder encodeInt:static_cast<int>(self.type) forKey:kTypeKey];
   [coder encodeFloat:self.position forKey:kPositionKey];
   [coder encodeInt64:self.folderId forKey:kFolderKey];
 }
 
 @end