Delete background tab IOSurfaces on Mac.

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 "content/common/content_export.h"
@@ skipping 481 matching lines @@
   // The scroll offset of the render view.
   IPC_STRUCT_MEMBER(gfx::Point, scroll_offset)
 
   // The regions of the bitmap (in view coords) that contain updated pixels.
   // In the case of scrolling, this includes the scroll damage rect.
   IPC_STRUCT_MEMBER(std::vector<gfx::Rect>, copy_rects)
 
   // The size of the RenderView when this message was generated.  This is
   // included so the host knows how large the view is from the perspective of
   // the renderer process.  This is necessary in case a resize operation is in
-  // progress.
+  // progress. If auto-resize is enabled, this should update the corresponding
+  // view size.
   IPC_STRUCT_MEMBER(gfx::Size, view_size)
 
   // New window locations for plugin child windows.
   IPC_STRUCT_MEMBER(std::vector<webkit::npapi::WebPluginGeometry>,
                     plugin_window_moves)
 
   // The following describes the various bits that may be set in flags:
   //
   //   ViewHostMsg_UpdateRect_Flags::IS_RESIZE_ACK
   //     Indicates that this is a response to a ViewMsg_Resize message.
@@ skipping 1390 matching lines @@
 
 // This message notifies the browser process that the plug-in
 // swapped the buffers associated with the given "window", which
 // should cause the browser to redraw the various plug-ins'
 // contents.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_AcceleratedSurfaceBuffersSwapped,
                     gfx::PluginWindowHandle /* window */,
                     uint64 /* surface_handle */)
 #endif
 
+// 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_ROUTED4(ViewHostMsg_CompositorSurfaceBuffersSwapped,
+                    int32 /* surface id */,
+                    uint64 /* surface_handle */,
+                    int32 /* route_id */,
+                    int32 /* gpu_process_host_id */)
+
 // Opens a file asynchronously. The response returns a file descriptor
 // and an error code from base/platform_file.h.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_AsyncOpenFile,
                     FilePath /* file path */,
                     int /* flags */,
                     int /* message_id */)
 
 //---------------------------------------------------------------------------
 // Request for cryptographic operation messages:
 // These are messages from the renderer to the browser to perform a
@@ skipping 85 matching lines @@
                     int  /* automation_id */)
 
 // Sent to the browser when the renderer detects it is blocked on a pepper
 // plugin message for too long. This is also sent when it becomes unhung
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)