Support cmd-left/right for history.

chrome/browser/tab_contents/tab_contents_view_mac.mm

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/tab_contents/tab_contents_view_mac.h"
 
 #include <string>
 
 #include "chrome/browser/browser.h" // TODO(beng): this dependency is awful.
 #import "chrome/browser/cocoa/focus_tracker.h"
+#import "chrome/browser/cocoa/chrome_browser_window.h"
+#import "chrome/browser/cocoa/browser_window_controller.h"
+#include "chrome/browser/global_keyboard_shortcuts_mac.h"
 #include "chrome/browser/cocoa/sad_tab_view.h"
 #import "chrome/browser/cocoa/web_drag_source.h"
 #import "chrome/browser/cocoa/web_drop_target.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 #include "chrome/browser/tab_contents/render_view_context_menu_mac.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/render_messages.h"
@@ skipping 266 matching lines @@
 
 - (void)setCurrentDragOperation:(NSDragOperation)operation {
   [dropTarget_ setCurrentOperation:operation];
 }
 
 - (TabContents*)tabContents {
   return tabContentsView_->tab_contents();
 }
 
 - (void)processKeyboardEvent:(NSEvent*)event {
+  // If this tab is no longer active, it's window will be |nil|. In that case,
+  // best ignore the event.
+  if (![self window])
+    return;
+
+  ChromeBrowserWindow* window = (ChromeBrowserWindow*)[self window];
+  DCHECK([window isKindOfClass:[ChromeBrowserWindow class]]);
+  if ([window handleExtraBrowserKeyboardShortcut:event])
+    return;
+  if ([window handleExtraWindowKeyboardShortcut:event])
+    return;
+
   if ([event type] == NSKeyDown)
     [super keyDown:event];
   else if ([event type] == NSKeyUp)
     [super keyUp:event];
 }
 
 - (void)mouseEvent:(NSEvent *)theEvent {
   TabContents* tabContents = [self tabContents];
   if (tabContents->delegate()) {
     if ([theEvent type] == NSMouseMoved)
@@ skipping 98 matching lines @@
 }
 
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
   return [dropTarget_ performDragOperation:sender view:self];
 }
 
 // Tons of stuff goes here, where we grab events going on in Cocoaland and send
 // them into the C++ system. TODO(avi): all that jazz
 
 @end