chrome: Add ability to handle chrome menu/keyboard commands (fixes issue #3280)

This change adds a CefCommandHandler::OnChromeCommand callback for optionally
handling Chrome commands triggered via menus or keyboard shortcuts. Supported
command IDs are listed in a new cef_command_ids.h header file.

To test: Run `cefclient --enable-chrome-runtime --hide-controls`. Most commands
will blocked and removed from context menus.

libcef_dll/ctocpp/command_handler_ctocpp.cc

@@ -0,0 +1,71 @@
+// Copyright (c) 2022 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+//
+// ---------------------------------------------------------------------------
+//
+// This file was generated by the CEF translator tool. If making changes by
+// hand only do so within the body of existing method and function
+// implementations. See the translator.README.txt file in the tools directory
+// for more information.
+//
+// $hash=431d97965f00a504f09790fd524ee23f69f16a82$
+//
+
+#include "libcef_dll/ctocpp/command_handler_ctocpp.h"
+#include "libcef_dll/cpptoc/browser_cpptoc.h"
+#include "libcef_dll/shutdown_checker.h"
+
+// VIRTUAL METHODS - Body may be edited by hand.
+
+NO_SANITIZE("cfi-icall")
+bool CefCommandHandlerCToCpp::OnChromeCommand(
+    CefRefPtr<CefBrowser> browser,
+    int command_id,
+    cef_window_open_disposition_t disposition) {
+  shutdown_checker::AssertNotShutdown();
+
+  cef_command_handler_t* _struct = GetStruct();
+  if (CEF_MEMBER_MISSING(_struct, on_chrome_command))
+    return false;
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Verify param: browser; type: refptr_diff
+  DCHECK(browser.get());
+  if (!browser.get())
+    return false;
+
+  // Execute
+  int _retval = _struct->on_chrome_command(
+      _struct, CefBrowserCppToC::Wrap(browser), command_id, disposition);
+
+  // Return type: bool
+  return _retval ? true : false;
+}
+
+// CONSTRUCTOR - Do not edit by hand.
+
+CefCommandHandlerCToCpp::CefCommandHandlerCToCpp() {}
+
+// DESTRUCTOR - Do not edit by hand.
+
+CefCommandHandlerCToCpp::~CefCommandHandlerCToCpp() {
+  shutdown_checker::AssertNotShutdown();
+}
+
+template <>
+cef_command_handler_t* CefCToCppRefCounted<
+    CefCommandHandlerCToCpp,
+    CefCommandHandler,
+    cef_command_handler_t>::UnwrapDerived(CefWrapperType type,
+                                          CefCommandHandler* c) {
+  NOTREACHED() << "Unexpected class type: " << type;
+  return nullptr;
+}
+
+template <>
+CefWrapperType CefCToCppRefCounted<CefCommandHandlerCToCpp,
+                                   CefCommandHandler,
+                                   cef_command_handler_t>::kWrapperType =
+    WT_COMMAND_HANDLER;