Creates coordinator for ActionSheet and TextInput

ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.mm

Index: ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.mm
diff --git a/ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.mm b/ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.mm
new file mode 100644
index 0000000000000000000000000000000000000000..4484ed9b1f2a7f07f498085437415ead8f4c2d06
--- /dev/null
+++ b/ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.mm
@@ -0,0 +1,58 @@
+// 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/alert_coordinator/action_sheet_coordinator.h"
+
+#import "base/mac/scoped_nsobject.h"
+
+@interface ActionSheetCoordinator () {
+  // Rectangle for the popover alert.
+  CGRect _rect;
+  // View for the popovert alert.
+  base::scoped_nsobject<UIView> _view;
+}
+
+// Override from super.
+- (UIAlertController*)alertControllerWithTitle:(NSString*)title
+                                       message:(NSString*)message;

[lpromero, 2016/07/21 21:47:50]

Why redeclaring? Isn't that an implementation detail from the parent class?

[gambard, 2016/07/22 13:51:19]

Done.
It was a "reminder" that this function is an override of the super class, but
this is not how we do this apparently :)

+@end
+
+@implementation ActionSheetCoordinator
+
+- (instancetype)initWithBaseViewController:(UIViewController*)viewController
+                                     title:(NSString*)title
+                                   message:(NSString*)message {
+  NOTREACHED();
+  return nil;
+}
+
+- (instancetype)initWithBaseViewController:(UIViewController*)viewController
+                                     title:(NSString*)title
+                                   message:(NSString*)message
+                                      rect:(CGRect)rect
+                                      view:(UIView*)view {
+  self = [super initWithBaseViewController:viewController
+                                     title:title
+                                   message:message];
+  if (self) {
+    _rect = rect;
+    _view.reset(view);

[lpromero, 2016/07/21 21:47:49]

Missing a retain.

[gambard, 2016/07/22 13:51:19]

Done.

+  }
+  return self;
+}
+
+- (UIAlertController*)alertControllerWithTitle:(NSString*)title
+                                       message:(NSString*)message {
+  UIAlertController* alert = [UIAlertController
+      alertControllerWithTitle:title
+                       message:message
+                preferredStyle:UIAlertControllerStyleActionSheet];
+
+  alert.popoverPresentationController.sourceView = _view;
+  alert.popoverPresentationController.sourceRect = _rect;
+
+  return alert;
+}
+
+@end