[MacViews] Use ChromeCommandDispatcherDelegate to handle keyboard shortcuts.

chrome/browser/ui/cocoa/chrome_command_dispatcher_delegate.mm

 // Copyright 2015 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 "chrome/browser/ui/cocoa/chrome_command_dispatcher_delegate.h"
 
 #include "base/logging.h"
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 61 matching lines @@
 }
 
 - (BOOL)eventHandledByExtensionCommand:(NSEvent*)event
                           isRedispatch:(BOOL)isRedispatch {
   // Some extension commands have higher priority than web content, and some
   // have lower priority. Regardless of whether the event is being redispatched,
   // let the extension system try to handle the event. In case this is a
   // redispatched event, [event window] gives the correct window.
   if ([event window]) {
     BrowserWindowController* controller = [[event window] windowController];
+    // |controller| is only set in Cocoa. In toolkit-views extension commands
+    // are handled elsewhere.

[tapted, 2015/08/28 05:48:14]

elsewhere -> something more specific?

[jackhou1, 2015/09/01 06:51:05]

Done.

     if ([controller respondsToSelector:@selector(handledByExtensionCommand:
                                                                   priority:)]) {
       ui::AcceleratorManager::HandlerPriority priority =
           isRedispatch ? ui::AcceleratorManager::kNormalPriority
                        : ui::AcceleratorManager::kHighPriority;
       if ([controller handledByExtensionCommand:event priority:priority])
         return YES;
     }
   }
   return NO;
 }
 
 - (BOOL)prePerformKeyEquivalent:(NSEvent*)event window:(NSWindow*)window {
   // Handle per-window shortcuts like cmd-1, but do not handle browser-level
   // shortcuts like cmd-left (else, cmd-left would do history navigation even
   // if e.g. the Omnibox has focus).
   return HandleExtraWindowKeyboardShortcut(event, window);
 }
 
 - (BOOL)postPerformKeyEquivalent:(NSEvent*)event window:(NSWindow*)window {
   // Handle per-window shortcuts like Esc after giving everybody else a chance
   // to handle them
   return HandleDelayedWindowKeyboardShortcut(event, window);
 }
 
 @end  // ChromeCommandDispatchDelegate