Revert 94743 - Allow the renderer process to map textures from one context into another.

gpu/command_buffer/service/gles2_cmd_decoder.h

Index: gpu/command_buffer/service/gles2_cmd_decoder.h
===================================================================
--- gpu/command_buffer/service/gles2_cmd_decoder.h	(revision 94806)
+++ gpu/command_buffer/service/gles2_cmd_decoder.h	(working copy)
@@ -12,7 +12,6 @@
 #include "base/callback.h"
 #include "base/callback_old.h"
 #include "build/build_config.h"
-#include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/service/common_decoder.h"
 #include "ui/gfx/size.h"
 
@@ -78,26 +77,6 @@
   // Destroys the graphics context.
   virtual void Destroy() = 0;
 
-  // Map a resource from an external context into this context. The source
-  // context need not be in the same share group from the client's point of
-  // view, allowing safe sharing between an "untrusted" context, like Pepper
-  // and a compositor context.
-  //
-  // Currently only texture resources are supported. TODO(apatrick): generalize
-  // this as appropriate.
-  //
-  // To unmap a previously mapped external resource, delete it in the
-  // destination context group. This will not delete the underlying texture
-  // object, just disassociate it with the id in the destination context group.
-  //
-  // The lifetime of the external resource is managed by the context group it
-  // was originally created in. When the last context in that group is destroyed
-  // the resource becomes invalid in all other context groups it is mapped into.
-  virtual bool MapExternalResource(resource_type::ResourceType resource_type,
-                                   uint32 resource_source_id,
-                                   GLES2Decoder* source_decoder,
-                                   uint32 resource_dest_id) = 0;
-
   virtual bool SetParent(GLES2Decoder* parent_decoder,
                          uint32 parent_texture_id) = 0;