refactor: rename the atom directory to shell

shell/browser/api/atom_api_web_contents_mac.mm

@@ -0,0 +1,32 @@
+// 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/api/atom_api_web_contents.h"
+#include "content/public/browser/render_widget_host_view.h"
+
+#import <Cocoa/Cocoa.h>
+
+namespace atom {
+
+namespace api {
+
+bool WebContents::IsFocused() const {
+  auto* view = web_contents()->GetRenderWidgetHostView();
+  if (!view)
+    return false;
+
+  if (GetType() != Type::BACKGROUND_PAGE) {
+    auto window = [web_contents()->GetNativeView().GetNativeNSView() window];
+    // On Mac the render widget host view does not lose focus when the window
+    // loses focus so check if the top level window is the key window.
+    if (window && ![window isKeyWindow])
+      return false;
+  }
+
+  return view->HasFocus();
+}
+
+}  // namespace api
+
+}  // namespace atom