[ios] Use dispatcher for ToolsMenu commands.

ios/clean/chrome/browser/ui/commands/tools_menu_commands.h

Index: ios/clean/chrome/browser/ui/commands/tools_menu_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/tools_menu_commands.h b/ios/clean/chrome/browser/ui/commands/tools_menu_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..47d3d040be7f81b7425c105ffd0b0496d4f032fb
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/tools_menu_commands.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_TOOLS_MENU_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_TOOLS_MENU_COMMANDS_H_
+
+// Command protocol for commands related to the ToolsMenu.
+@protocol ToolsMenuCommands
+@optional

[lpromero, 2017/03/31 06:34:38]

Why @optional?
When adding optional methods to a protocol, it is useful to also make the
protocol conform to the NSObject protocol. That way you can do:
id<MyProtocol> some = …
if ([some respondsToSelector:@selector(protocolMethod)]) {
…

[sczs, 2017/03/31 17:32:57]

I was thinking about the same. Depending on how we group these protocol methods
I might change some to required. This because some other Classes/Coordinators
only need to implement some of them, like the PresentationController with close,
or the TabGrid Menu won't have a shareMenu implementation,etc.

Thanks for the NSObject protocol tip, makes a lot of sense! 

+// Shows the tools menu.
+- (void)showToolsMenu;
+
+// Closes the tools menu.
+- (void)closeToolsMenu;
+
+// Displays the Share menu.
+- (void)showShareMenu;
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_TOOLS_MENU_COMMANDS_H_