Handle keyboard events for WebContents that do not have owner window

atom/browser/common_web_contents_delegate_mac.mm

@@ -0,0 +1,39 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/common_web_contents_delegate.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+
+namespace atom {
+
+void CommonWebContentsDelegate::HandleKeyboardEvent(
+    content::WebContents* source,
+    const content::NativeWebKeyboardEvent& event) {
+  if (event.skip_in_browser ||
+      event.type == content::NativeWebKeyboardEvent::Char)
+    return;
+
+  // Escape exits tabbed fullscreen mode.
+  if (event.windowsKeyCode == ui::VKEY_ESCAPE && is_html_fullscreen())
+    ExitFullscreenModeForTab(source);
+
+  BOOL handled = [[NSApp mainMenu] performKeyEquivalent:event.os_event];
+  if (!handled && event.os_event.window) {
+    // Handle the cmd+~ shortcut.
+    if ((event.os_event.modifierFlags & NSCommandKeyMask) /* cmd */ &&
+        (event.os_event.keyCode == 50  /* ~ */)) {
+      if (event.os_event.modifierFlags & NSShiftKeyMask) {
+        [NSApp sendAction:@selector(_cycleWindowsReversed:) to:nil from:nil];
+      } else {
+        [NSApp sendAction:@selector(_cycleWindows:) to:nil from:nil];
+      }
+    }
+  }
+}
+
+}  // namespace atom