Make certificate viewer non-modal using BaseShellDialog to fix aura painting

ui/shell_dialogs/certificate_viewer_dialog_win.h

+// Copyright 2013 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 UI_SHELL_DIALOGS_CERTIFICATE_VIEWER_DIALOG_WIN_H_
+#define UI_SHELL_DIALOGS_CERTIFICATE_VIEWER_DIALOG_WIN_H_
+
+#include <windows.h>
+#include <cryptuiapi.h>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "ui/shell_dialogs/base_shell_dialog_win.h"
+#include "ui/shell_dialogs/shell_dialogs_export.h"
+
+namespace net {
+class X509Certificate;
+}
+
+namespace ui {
+
+// A thin wrapper around the native certificate viewer dialog that uses
+// BaseShellDialog to have the dialog run on a background thread. This needs
+// to be on a background thread so that base::MessageLoop can keep running
+// and run delayed tasks (mostly importantly the gpu messages that do
+// painting).
+class SHELL_DIALOGS_EXPORT CertificateViewerDialogWin
+    : public BaseShellDialogImpl {
+ public:
+  // Called to open the certificate dialog on a background thread.
+  // |owning_window| is the parent HWND, and |certificate| is the certificate
+  // to be displayed.
+  static void Show(HWND owning_window, const net::X509Certificate& certificate);
+
+ private:
+  CertificateViewerDialogWin(HWND owning_window,
+                             const net::X509Certificate& certificate);
+
+  // A struct for holding all the state necessary for displaying the
+  // certificate viewer dialog.
+  struct ExecuteCertificateViewerParams {
+    ExecuteCertificateViewerParams(RunState run_state,
+                                   HWND owner,
+                                   PCCERT_CONTEXT cert_list)
+        : run_state(run_state),
+          owner(owner),
+          cert_list(cert_list),
+          ui_proxy(base::MessageLoopForUI::current()->message_loop_proxy()) {}
+
+    RunState run_state;
+    HWND owner;
+    PCCERT_CONTEXT cert_list;
+    scoped_refptr<base::MessageLoopProxy> ui_proxy;
+  };
+
+  // Runs the certificate viewer dialog. Should be run on the the
+  // BaseShellDialogImpl thread. Posts back to CertificateViewerCompleted on
+  // the UI thread on completion.
+  void ExecuteCertificateViewer(const ExecuteCertificateViewerParams& params);
+
+  // Handler for the result of the certificate viewer dialog. Should be run on
+  // the UI thread.
+  void CertificateViewerCompleted(const ExecuteCertificateViewerParams& params);
+
+  DISALLOW_COPY_AND_ASSIGN(CertificateViewerDialogWin);
+};
+
+}  // namespace ui
+
+#endif  // UI_SHELL_DIALOGS_CERTIFICATE_VIEWER_DIALOG_WIN_H_