Use a struct for cc::Surface ids for more type safety

content/common/cc_messages.h

 // 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.
 //
 // IPC Messages sent between compositor instances.
 
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/filter_operation.h"
 #include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/io_surface_draw_quad.h"
 #include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/render_pass.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
 #include "cc/quads/surface_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/quads/tile_draw_quad.h"
 #include "cc/quads/yuv_video_draw_quad.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/returned_resource.h"
 #include "cc/resources/transferable_resource.h"
+#include "cc/surfaces/surface_id.h"
 #include "content/common/content_export.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 #include "ipc/ipc_message_macros.h"
 
 #ifndef CONTENT_COMMON_CC_MESSAGES_H_
 #define CONTENT_COMMON_CC_MESSAGES_H_
 
 namespace gfx {
 class Transform;
 }
@@ skipping 94 matching lines @@
 IPC_ENUM_TRAITS_MAX_VALUE(cc::ResourceFormat, cc::RESOURCE_FORMAT_MAX)
 IPC_ENUM_TRAITS_MAX_VALUE(SkXfermode::Mode, SkXfermode::kLastMode)
 IPC_ENUM_TRAITS_MAX_VALUE(cc::YUVVideoDrawQuad::ColorSpace,
                           cc::YUVVideoDrawQuad::COLOR_SPACE_LAST)
 
 IPC_STRUCT_TRAITS_BEGIN(cc::RenderPass::Id)
   IPC_STRUCT_TRAITS_MEMBER(layer_id)
   IPC_STRUCT_TRAITS_MEMBER(index)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(cc::SurfaceId)
+IPC_STRUCT_TRAITS_MEMBER(id)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(cc::DrawQuad)
   IPC_STRUCT_TRAITS_MEMBER(material)
   IPC_STRUCT_TRAITS_MEMBER(rect)
   IPC_STRUCT_TRAITS_MEMBER(opaque_rect)
   IPC_STRUCT_TRAITS_MEMBER(visible_rect)
   IPC_STRUCT_TRAITS_MEMBER(needs_blending)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(cc::CheckerboardDrawQuad)
   IPC_STRUCT_TRAITS_PARENT(cc::DrawQuad)
@@ skipping 119 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(overdraw_bottom_height)
   IPC_STRUCT_TRAITS_MEMBER(latency_info)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(cc::GLFrameData)
   IPC_STRUCT_TRAITS_MEMBER(mailbox)
   IPC_STRUCT_TRAITS_MEMBER(sync_point)
   IPC_STRUCT_TRAITS_MEMBER(size)
   IPC_STRUCT_TRAITS_MEMBER(sub_buffer_rect)
 IPC_STRUCT_TRAITS_END()