[iOS Clean] Wired up ContextMenuCommands.

ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h

Index: ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h
diff --git a/ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h b/ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h
index 055569981cbaf8810d8ff3b89a781fde699c4208..361cee1d48ae006c2187f2865a79be1b243be410 100644
--- a/ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h
+++ b/ios/clean/chrome/browser/ui/context_menu/context_menu_view_controller.h
@@ -9,13 +9,14 @@
 
 #import "ios/clean/chrome/browser/ui/context_menu/context_menu_consumer.h"
 
+@protocol ContextMenuCommands;
+@class ContextMenuContext;
+
 // A view controller that displays a context menu.
 @interface ContextMenuViewController : UIAlertController<ContextMenuConsumer>
 
-// Create an instance of this class with the dispatcher |dispatcher|.
-//
-// PLACEHOLDER: Once commands are defined, define a protocol for the dispatcher.
-- (instancetype)initWithDispatcher:(id)dispatcher;
+// Designated initializer that uses |dispatcher| to communicate commands.

[edchin, 2017/05/25 21:41:53]

Should this be labeled with NS_DESIGNATED_INITIALIZER?
And should the default initializer be restricted?

[kkhorimoto, 2017/05/26 23:20:09]

The only way to set the UIAlertController's |preferredStyle| property is via the
factory method that we call in our initializer.  If we were to make this the
designated initializer, we would need to call a superclass's designated
initializer instead of that factory method, so we wouldn't be able to set the
preferred style.

+- (instancetype)initWithDispatcher:(id<ContextMenuCommands>)dispatcher;
 
 @end