Allow the renderer process to map textures from one context into another.

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
===================================================================
--- content/common/gpu/gpu_command_buffer_stub.cc	(revision 94701)
+++ content/common/gpu/gpu_command_buffer_stub.cc	(working copy)
@@ -73,6 +73,8 @@
   IPC_BEGIN_MESSAGE_MAP(GpuCommandBufferStub, message)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Initialize,
                                     OnInitialize);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_MapExternalResource,
+                        OnMapExternalResource);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_SetParent,
                                     OnSetParent);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_GetState, OnGetState);
@@ -246,6 +248,22 @@
   Send(reply_message);
 }
 
+

[jamesr, 2011/07/29 19:55:08]

nit: extra newline

+void GpuCommandBufferStub::OnMapExternalResource(
+    gpu::resource_type::ResourceType resource_type,
+    uint32 resource_source_id,
+    int32 source_route_id,
+    uint32 resource_dest_id) {
+  GpuCommandBufferStub* source_stub =
+      channel_->LookupCommandBuffer(source_route_id);
+
+  scheduler_->MapExternalResource(
+      resource_type,
+      resource_source_id,
+      source_stub ? source_stub->scheduler() : NULL,
+      resource_dest_id);
+}
+
 void GpuCommandBufferStub::OnSetParent(int32 parent_route_id,
                                        uint32 parent_texture_id,
                                        IPC::Message* reply_message) {