[mojo talk demo] Convert utility process CheckMediaFile IPC to mojo

chrome/utility/chrome_content_utility_client.cc

 // Copyright (c) 2012 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/utility/chrome_content_utility_client.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 174 matching lines @@
     // for loop was using iterators explicitly, as originally done).
     if (handler->OnMessageReceived(message))
       return true;
   }
 
   return false;
 }
 
 void ChromeContentUtilityClient::ExposeInterfacesToBrowser(
     service_manager::InterfaceRegistry* registry) {
-  // When the utility process is running with elevated privileges, we need to
-  // filter messages so that only a whitelist of IPCs can run. In Mojo, there's
-  // no way of filtering individual messages. Instead, we can avoid adding
-  // non-whitelisted Mojo services to the service_manager::InterfaceRegistry.
-  // TODO(amistry): Use a whitelist once the whistlisted IPCs have been
-  // converted to Mojo.
-  if (filter_messages_)
+  const bool running_elevated =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kUtilityProcessRunningElevated);
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+  extensions::ExtensionsHandler::ExposeInterfacesToBrowser(registry,
+                                                           running_elevated);
+#endif
+  // If our process runs with elevated privileges, only add elevated
+  // Mojo services to the service_manager::InterfaceRegistry.
+  if (running_elevated)
     return;
 
 #if !defined(OS_ANDROID)
   registry->AddInterface<net::interfaces::ProxyResolverFactory>(
       base::Bind(CreateProxyResolverFactory));
   registry->AddInterface(base::Bind(CreateResourceUsageReporter));
   registry->AddInterface(base::Bind(&ProfileImportHandler::Create));
 #endif
   registry->AddInterface(
       base::Bind(&safe_json::SafeJsonParserMojoImpl::Create));
@@ skipping 96 matching lines @@
   safe_browsing::zip_analyzer::Results results;
   safe_browsing::dmg::AnalyzeDMGFile(
       IPC::PlatformFileForTransitToFile(dmg_file), &results);
   Send(new ChromeUtilityHostMsg_AnalyzeDmgFileForDownloadProtection_Finished(
       results));
   ReleaseProcessIfNeeded();
 }
 #endif  // defined(OS_MACOSX)
 
 #endif  // defined(FULL_SAFE_BROWSING)