Adding mediator for Sign-in promo

ios/chrome/browser/ui/authentication/signin_promo_view.h

+// 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGN_PROMO_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGN_PROMO_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+@class MDCFlatButton;
+@class SigninPromoView;
+
+// Configures a SigninPromoView view.
+@protocol SigninPromoViewConfigurator<NSObject>
+
+- (void)configureSigninPromoView:(SigninPromoView*)signinPromoView;
+
+@end
+
+typedef NS_ENUM(NSInteger, SigninPromoViewMode) {
+  // No profile is known.
+  SigninPromoViewColdStateMode,

[msarda, 2017/03/27 09:34:16]

I think this should be SigninPromoViewModeColdState and
SigninPromoViewModeWarmState

See
https://google.github.io/styleguide/objcguide.xml?showone=Variable_Names#Vari...

[jlebel, 2017/03/27 21:34:42]

Done.

+  // At least one profile is known and the user can sign without entering their
+  // password.
+  SigninPromoViewWarmStateMode,
+};
+
+// This class creates an image view, a label and 2 buttons. This view can be
+// configured with 2 modes : "Cold State" and "Warm State".
+// + "Cold State" mode displays the chrome/chomium icon in the image view, and

[lpromero, 2017/03/27 13:14:46]

chromium

[jlebel, 2017/03/27 21:34:42]

Done.

+//    only displays the primary button.
+// + "Warm State" mode displays the image view (big than the cold state mode),
+//   displays both buttons.
+//
+// The owner is in charge to set:
+//   - the image for |imageView|, using -[SigninPromoView setProfileImage:]
+//     (only for "Warm State")
+//   - the label for |textLabel|
+//   - the title for |primaryButton|
+//   - the title for |secondaryButton|
+@interface SigninPromoView : UIView
+
+@property(nonatomic) SigninPromoViewMode mode;
+@property(nonatomic, readonly) UIImageView* imageView;
+@property(nonatomic, readonly) UILabel* textLabel;
+@property(nonatomic, readonly) MDCFlatButton* primaryButton;
+@property(nonatomic, readonly) MDCFlatButton* secondaryButton;
+
+// Horizontal padding used for |textLabel|, |primaryButton| and
+// |secondaryButton|. Used to compute the preferred max layout of |textLabel|.
+@property(nonatomic, readonly) CGFloat horizontalPadding;
+
+- (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
+
+// Sets the image in |imageView|. This method will add a circular background
+// using CircularImageFromImage() (so if the image is not squared, it will be
+// cropped first). Should be called only with the "Warm State" mode. The image
+// is not changed when "Cold State" mode.
+- (void)setProfileImage:(UIImage*)image;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGN_PROMO_VIEW_H_