Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/side_swipe/history_side_swipe_provider.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/ui/side_swipe/history_side_swipe_provider.h"
+
+@interface HistorySideSwipeProvider () {
+  // Keep a reference to detach before deallocing.
+  TabModel* _tabModel;  // weak
+}
+
+@end
+
+@implementation HistorySideSwipeProvider
+- (instancetype)initWithTabModel:(TabModel*)tabModel {
+  self = [super init];
+  if (self) {
+    _tabModel = tabModel;
+  }
+  return self;
+}
+
+- (BOOL)canGoBack {
+  return [[_tabModel currentTab] canGoBack];
+}
+
+- (BOOL)canGoForward {
+  return [[_tabModel currentTab] canGoForward];
+}
+
+- (void)goForward:(web::WebState*)webState {
+  [[_tabModel currentTab] goForward];
+}
+
+- (void)goBack:(web::WebState*)webState {
+  [[_tabModel currentTab] goBack];
+}
+
+- (UIImage*)paneIcon {
+  return [UIImage imageNamed:@"side_swipe_navigation_back"];
+}
+
+- (BOOL)rotateForwardIcon {
+  return YES;
+}
+
+@end