Part 3/3 (RWH/IOSurface) of adding with device scale factor to transport surfaces

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index b036cf53feb2fe377a4eb526940814e1f5fbe1c3..a03409965e6b13e33676ec651555354634bf522b 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -2022,15 +2022,22 @@ IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateFrameName,
                     bool /* is_top_level */,
                     std::string /* name */)
 
+
+IPC_STRUCT_BEGIN(ViewHostMsg_CompositorSurfaceBuffersSwapped_Params)
+  IPC_STRUCT_MEMBER(int32, surface_id)
+  IPC_STRUCT_MEMBER(uint64, surface_handle)
+  IPC_STRUCT_MEMBER(int32, route_id)
+  IPC_STRUCT_MEMBER(gfx::Size, size)
+  IPC_STRUCT_MEMBER(float, scale_factor)
+  IPC_STRUCT_MEMBER(int32, gpu_process_host_id)
+IPC_STRUCT_END()
+
 // This message is synthesized by GpuProcessHost to pass through a swap message
 // to the RenderWidgetHelper. This allows GetBackingStore to block for either a
 // software or GPU frame.
-IPC_MESSAGE_ROUTED5(ViewHostMsg_CompositorSurfaceBuffersSwapped,
-                    int32 /* surface id */,
-                    uint64 /* surface_handle */,
-                    int32 /* route_id */,
-                    gfx::Size /* size */,
-                    int32 /* gpu_process_host_id */)
+IPC_MESSAGE_ROUTED1(
+    ViewHostMsg_CompositorSurfaceBuffersSwapped,
+    ViewHostMsg_CompositorSurfaceBuffersSwapped_Params /* params */)
 
 IPC_MESSAGE_ROUTED1(ViewHostMsg_SwapCompositorFrame,
                     cc::CompositorFrame /* frame */)