Revert "gpu: Use mojom API for creating gpu channel."

content/common/gpu_host_messages.h

 // Copyright 2016 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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/establish_channel_params.h"
@@ skipping 27 matching lines @@
 
 IPC_STRUCT_BEGIN(GpuMsg_CreateGpuMemoryBuffer_Params)
   IPC_STRUCT_MEMBER(gfx::GpuMemoryBufferId, id)
   IPC_STRUCT_MEMBER(gfx::Size, size)
   IPC_STRUCT_MEMBER(gfx::BufferFormat, format)
   IPC_STRUCT_MEMBER(gfx::BufferUsage, usage)
   IPC_STRUCT_MEMBER(int32_t, client_id)
   IPC_STRUCT_MEMBER(gpu::SurfaceHandle, surface_handle)
 IPC_STRUCT_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::EstablishChannelParams)
+  IPC_STRUCT_TRAITS_MEMBER(client_id)
+  IPC_STRUCT_TRAITS_MEMBER(client_tracing_id)
+  IPC_STRUCT_TRAITS_MEMBER(preempts)
+  IPC_STRUCT_TRAITS_MEMBER(allow_view_command_buffers)
+  IPC_STRUCT_TRAITS_MEMBER(allow_real_time_streams)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(gpu::GpuPreferences)
   IPC_STRUCT_TRAITS_MEMBER(single_process)
   IPC_STRUCT_TRAITS_MEMBER(in_process_gpu)
   IPC_STRUCT_TRAITS_MEMBER(ui_prioritize_in_gpu_process)
   IPC_STRUCT_TRAITS_MEMBER(disable_accelerated_video_decode)
 #if defined(OS_CHROMEOS)
   IPC_STRUCT_TRAITS_MEMBER(disable_vaapi_accelerated_video_encode)
 #endif
 #if BUILDFLAG(ENABLE_WEBRTC)
   IPC_STRUCT_TRAITS_MEMBER(disable_web_rtc_hw_encoding)
@@ skipping 27 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(use_passthrough_cmd_decoder)
 IPC_STRUCT_TRAITS_END()
 
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
 
 // Tells the GPU process to shutdown itself.
 IPC_MESSAGE_CONTROL0(GpuMsg_Finalize)
 
+// Tells the GPU process to create a new channel for communication with a
+// given client.  The channel name is returned in a
+// GpuHostMsg_ChannelEstablished message.  The client ID is passed so
+// that the GPU process reuses an existing channel to that process if it exists.
+// This ID is a unique opaque identifier generated by the browser process.
+// The client_tracing_id is a unique ID used for the purposes of tracing.
+IPC_MESSAGE_CONTROL1(GpuMsg_EstablishChannel,
+                     content::EstablishChannelParams /* params */)
+
 // Tells the GPU process to close the channel identified by |client_id|.
 // If no channel can be identified, do nothing.
 IPC_MESSAGE_CONTROL1(GpuMsg_CloseChannel, int32_t /* client_id */)
 
 // Tells the GPU process to create a new gpu memory buffer.
 IPC_MESSAGE_CONTROL1(GpuMsg_CreateGpuMemoryBuffer,
                      GpuMsg_CreateGpuMemoryBuffer_Params)
 
 // Tells the GPU process to destroy buffer.
 IPC_MESSAGE_CONTROL3(GpuMsg_DestroyGpuMemoryBuffer,
@@ skipping 33 matching lines @@
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.
 
 // Response from GPU to a GputMsg_Initialize message.
 IPC_MESSAGE_CONTROL3(GpuHostMsg_Initialized,
                      bool /* result */,
                      ::gpu::GPUInfo /* gpu_info */,
                      ::gpu::GpuFeatureInfo /* gpu_feature_info */)
 
+// Response from GPU to a GpuHostMsg_EstablishChannel message.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_ChannelEstablished,
+                     IPC::ChannelHandle /* channel_handle */)
+
 // Message to the GPU that a shader was loaded from disk.
 IPC_MESSAGE_CONTROL1(GpuMsg_LoadedShader, std::string /* encoded shader */)
 
 // Response from GPU to a GpuMsg_CreateGpuMemoryBuffer message.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GpuMemoryBufferCreated,
                      gfx::GpuMemoryBufferHandle /* handle */)
 
 // Response from GPU to a GpuMsg_CollectGraphicsInfo.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                      gpu::GPUInfo /* GPU logging stats */)
 
 #if defined(OS_ANDROID)
 // Response to a GpuMsg_DestroyingVideoSurface message.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyingVideoSurfaceAck,
                      int /* surface_id */)
 #endif
 
 // Message from GPU to add a GPU log message to the about:gpu page.
 IPC_MESSAGE_CONTROL3(GpuHostMsg_OnLogMessage,
                      int /*severity*/,
                      std::string /* header */,
                      std::string /* message */)
 
 // Sent by the GPU process to indicate that a fields trial has been activated.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_FieldTrialActivated, std::string /* name */)