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

content/common/view_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 for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 2004 matching lines @@
 // terminated.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_SuddenTerminationChanged,
                      bool /* enabled */)
 
 // Informs the browser of updated frame names.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateFrameName,
                     int /* frame_id */,
                     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 */)
 
 // Sent by the compositor when input scroll events are dropped due to bounds
 // restricions on the root scroll offset.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_DidOverscroll,
                     gfx::Vector2dF /* accumulated_overscroll */,
                     gfx::Vector2dF /* current_fling_velocity */)
 
@@ skipping 256 matching lines @@
 // Since the browser keeps handles to the allocated transport DIBs, this
 // message is sent to tell the browser that it may release them when the
 // renderer is finished with them.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_FreeTransportDIB,
                      TransportDIB::Id /* DIB id */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.