Plumb the partial swap though image transport.

content/common/gpu/gpu_messages.h

 // Copyright (c) 2011 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 <vector>
 #include <string>
 
@@ skipping 40 matching lines @@
   IPC_STRUCT_MEMBER(int32, render_view_id)
   IPC_STRUCT_MEMBER(uint64, surface_id)
   IPC_STRUCT_MEMBER(int32, route_id)
 #if defined(OS_WIN)
   IPC_STRUCT_MEMBER(gfx::Size, size)
 #elif defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params)
+  IPC_STRUCT_MEMBER(int32, renderer_id)
+  IPC_STRUCT_MEMBER(int32, render_view_id)
+  IPC_STRUCT_MEMBER(uint64, surface_id)
+  IPC_STRUCT_MEMBER(int32, route_id)
+  IPC_STRUCT_MEMBER(int, x)
+  IPC_STRUCT_MEMBER(int, y)
+  IPC_STRUCT_MEMBER(int, width)
+  IPC_STRUCT_MEMBER(int, height)
+#if defined(OS_MACOSX)
+  IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
+#endif
+IPC_STRUCT_END()
+
 IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceRelease_Params)
   IPC_STRUCT_MEMBER(int32, renderer_id)
   IPC_STRUCT_MEMBER(int32, render_view_id)
   IPC_STRUCT_MEMBER(uint64, identifier)
   IPC_STRUCT_MEMBER(int32, route_id)
 #if defined(OS_MACOSX)
   IPC_STRUCT_MEMBER(gfx::PluginWindowHandle, window)
 #endif
 IPC_STRUCT_END()
 
@@ skipping 73 matching lines @@
 // Tells the GPU process that the browser process has finished resizing the
 // view.
 IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_ResizeViewACK)
 
 // Tells the GPU process that it's safe to start rendering to the surface.
 IPC_MESSAGE_ROUTED2(AcceleratedSurfaceMsg_NewACK,
                     uint64 /* surface_id */,
                     TransportDIB::Handle /* shared memory buffer */)
 
 // Tells the GPU process that the browser process handled the swap
-// buffers request with the given number.
+// buffers request.
 IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_BuffersSwappedACK)
 
+// Tells the GPU process that the browser process handled the
+// PostSubBuffer command.
+IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_PostSubBufferACK)
+
 // Tells the GPU process to remove all contexts.
 IPC_MESSAGE_CONTROL0(GpuMsg_Clean)
 
 // Tells the GPU process to crash.
 IPC_MESSAGE_CONTROL0(GpuMsg_Crash)
 
 // Tells the GPU process to hang.
 IPC_MESSAGE_CONTROL0(GpuMsg_Hang)
 
 //------------------------------------------------------------------------------
@@ skipping 49 matching lines @@
                      int32 /* route_id */,
                      gfx::Size /* size */)
 
 // This message is sent from the GPU process to the browser to notify about a
 // new or resized surface in the GPU.  The browser allocates any resources
 // needed for it on its end and replies with an ACK containing any shared
 // resources/identifiers to be used in the GPU.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_AcceleratedSurfaceNew,
                      GpuHostMsg_AcceleratedSurfaceNew_Params)
 
-// This message notifies the browser process that the renderer
-// swapped the buffers associated with the given "window", which
-// should cause the browser to redraw the compositor's contents.
+// Same as above with a rect of the part of the surface that changed.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                      GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params)
 
+// This message notifies the browser process that the renderer
+// swapped a portion of the buffers associated with the given "window", which
+// should cause the browser to redraw the compositor's contents.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_AcceleratedSurfacePostSubBuffer,
+                     GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params)
+
 // Tells the browser to release whatever resources are associated with
 // the given surface. The browser must send an ACK once this operation
 // is complete.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_AcceleratedSurfaceRelease,
                      GpuHostMsg_AcceleratedSurfaceRelease_Params)
 
 //------------------------------------------------------------------------------
 // GPU Channel Messages
 // These are messages from a renderer process to the GPU process.
 
@@ skipping 244 matching lines @@
 
 // Confirm decoder has been reset.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_ResetDone)
 
 // Decoder has faced end of stream marker in the stream.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_EndOfStream)
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */