[mojo] Use a pipe path to initialise Mojo in elevated utility processes.

content/child/child_thread_impl.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 "content/child/child_thread_impl.h"
 
 #include <signal.h>
 #include <string>
 #include <utility>
 
@@ skipping 48 matching lines @@
 #include "ipc/attachment_broker.h"
 #include "ipc/attachment_broker_unprivileged.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_platform_file.h"
 #include "ipc/ipc_switches.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "ipc/mojo/ipc_channel_mojo.h"
 #include "ipc/mojo/scoped_ipc_support.h"
 #include "mojo/edk/embedder/embedder.h"
+#include "mojo/edk/embedder/named_platform_channel_pair.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 
 #if defined(OS_POSIX)
 #include "base/posix/global_descriptors.h"
 #include "content/public/common/content_descriptors.h"
 #endif
 
 using tracked_objects::ThreadData;
 
 namespace content {
@@ skipping 142 matching lines @@
 
   closure_.Run();
 }
 
 base::LazyInstance<QuitClosure> g_quit_closure = LAZY_INSTANCE_INITIALIZER;
 #endif
 
 void InitializeMojoIPCChannel() {
   mojo::edk::ScopedPlatformHandle platform_channel;
 #if defined(OS_WIN)
-  platform_channel =
-      mojo::edk::PlatformChannelPair::PassClientHandleFromParentProcess(
-          *base::CommandLine::ForCurrentProcess());
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      mojo::edk::PlatformChannelPair::kMojoPlatformChannelHandleSwitch)) {
+    platform_channel =
+        mojo::edk::PlatformChannelPair::PassClientHandleFromParentProcess(
+            *base::CommandLine::ForCurrentProcess());
+  } else {
+    // If this process is elevated, it will have a pipe path passed on the
+    // command line.
+    platform_channel =
+        mojo::edk::NamedPlatformChannelPair::PassClientHandleFromParentProcess(
+            *base::CommandLine::ForCurrentProcess());
+  }
 #elif defined(OS_POSIX)
   platform_channel.reset(mojo::edk::PlatformHandle(
       base::GlobalDescriptors::GetInstance()->Get(kMojoIPCChannel)));
 #endif
   // Mojo isn't supported on all child process types.
   // TODO(crbug.com/604282): Support Mojo in the remaining processes.
   if (!platform_channel.is_valid())
     return;
   mojo::edk::SetParentPipeHandle(std::move(platform_channel));
 }
@@ skipping 489 matching lines @@
 void ChildThreadImpl::EnsureConnected() {
   VLOG(0) << "ChildThreadImpl::EnsureConnected()";
   base::Process::Current().Terminate(0, false);
 }
 
 bool ChildThreadImpl::IsInBrowserProcess() const {
   return static_cast<bool>(browser_process_io_runner_);
 }
 
 }  // namespace content