Use ChannelMojo for Browser-GPU and Renderer-GPU IPC.

gpu/ipc/service/gpu_channel.cc

Index: gpu/ipc/service/gpu_channel.cc
diff --git a/gpu/ipc/service/gpu_channel.cc b/gpu/ipc/service/gpu_channel.cc
index 73abc9c6867bc5820894b7ef368750805a845273..f069393276bd9b65701532dbb3babb3c93b15304 100644
--- a/gpu/ipc/service/gpu_channel.cc
+++ b/gpu/ipc/service/gpu_channel.cc
@@ -41,6 +41,7 @@
 #include "gpu/ipc/service/gpu_memory_buffer_factory.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/message_filter.h"
+#include "mojo/public/cpp/system/message_pipe.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_image_shared_memory.h"
 #include "ui/gl/gl_surface.h"
@@ -630,22 +631,20 @@ IPC::ChannelHandle GpuChannel::Init(base::WaitableEvent* shutdown_event) {
   DCHECK(!channel_);
 
   IPC::ChannelHandle channel_handle(channel_id_);
+  IPC::ChannelHandle client_channel_handle = channel_handle;
+    mojo::MessagePipe pipe_pair;
+    DCHECK(pipe_pair.handle0.is_valid());
+    DCHECK(pipe_pair.handle1.is_valid());
+    channel_handle = IPC::ChannelHandle(pipe_pair.handle0.release());
+    client_channel_handle = IPC::ChannelHandle(pipe_pair.handle1.release());
 
   channel_ =
-      IPC::SyncChannel::Create(channel_handle, IPC::Channel::MODE_SERVER, this,
-                               io_task_runner_, false, shutdown_event);
-
-#if defined(OS_POSIX)
-  // On POSIX, pass the renderer-side FD. Also mark it as auto-close so
-  // that it gets closed after it has been sent.
-  base::ScopedFD renderer_fd = channel_->TakeClientFileDescriptor();
-  DCHECK(renderer_fd.is_valid());
-  channel_handle.socket = base::FileDescriptor(std::move(renderer_fd));
-#endif
+      IPC::SyncChannel::Create(channel_handle, IPC::Channel::MODE_SERVER,
+                               this, io_task_runner_, false, shutdown_event);
 
   channel_->AddFilter(filter_.get());
 
-  return channel_handle;
+  return client_channel_handle;
 }
 
 void GpuChannel::SetUnhandledMessageListener(IPC::Listener* listener) {