[ios clean] Add placeholder for NTP bookmarks, chrome home and open tabs.

ios/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.mm

Index: ios/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.mm b/ios/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.mm
new file mode 100644
index 0000000000000000000000000000000000000000..c4b1c57a5bce3518759f73e66710d3fd5b02d862
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.mm
@@ -0,0 +1,47 @@
+// Copyright 2017 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/clean/chrome/browser/ui/open_tabs/open_tabs_coordinator.h"
+
+#import "ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_panel_controller.h"
+#import "ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_panel_view_controller.h"
+#include "ios/chrome/browser/ui/ui_util.h"
+#import "ios/shared/chrome/browser/coordinator_context/coordinator_context.h"
+#import "ios/shared/chrome/browser/ui/browser_list/browser.h"
+#import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface OpenTabsCoordinator ()
+@property(nonatomic, strong) UIViewController* viewController;
+@property(nonatomic, strong) RecentTabsPanelController* wrapperViewController;
+@end
+
+@implementation OpenTabsCoordinator
+@synthesize viewController = _viewController;
+@synthesize wrapperViewController = _wrapperViewController;
+
+- (void)start {
+  // HACK: Re-using old view controllers for now.
+  if (!IsIPadIdiom()) {
+    self.viewController = [RecentTabsPanelViewController
+        controllerToPresentForBrowserState:self.browser->browser_state()
+                                    loader:nil];
+    self.viewController.modalPresentationStyle = UIModalPresentationFormSheet;
+    self.viewController.modalPresentationCapturesStatusBarAppearance = YES;
+    [self.context.baseViewController presentViewController:self.viewController
+                                                  animated:self.context.animated
+                                                completion:nil];
+  } else {
+    self.wrapperViewController = [[RecentTabsPanelController alloc]
+        initWithLoader:nil
+          browserState:self.browser->browser_state()];
+    self.viewController = [self.wrapperViewController viewController];
+  }
+  [super start];
+}
+
+@end