Add a command to lose the context

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 3325 matching lines @@
   } else {
     result = DoCommonCommand(command, arg_count, cmd_data);
   }
   if (result == error::kNoError && current_decoder_error_ != error::kNoError) {
       result = current_decoder_error_;
       current_decoder_error_ = error::kNoError;
   }
   return result;
 }
 
+error::Error GLES2DecoderImpl::HandleLoseContextCHROMIUM(
+    uint32 immediate_data_size, const gles2::LoseContextCHROMIUM& c) {
+  // TODO(gman): I suspect it's not this simple. The most common context
+  // lost event is currently the GPU process crashing which will take down all
+  // contexts. After that, it seems likely you'd want to lose all contexts in
+  // the current ContextGroup otherwise you'll likely leak resources.

[Ken Russell (switch to Gerrit), 2012/12/15 01:21:28]

Yes -- I think the command should lose all contexts in the context group. This
is the way GL_ARB_robustness and GL_EXT_robustness are specified to work, and
this command should probably emulate their behavior as closely as possible.

Also, could the command take two enums? It would be useful to be able to send
down current_context_reset_code and other_contexts_reset_code, each one of the
GL_ARB_robustness guilty/innocent/unknown statuses. It would be useful to test
"guilty" for the current context and "innocent" for all the others
(ARB_robustness' behavior on Linux), as well as "unknown" for all contexts
(ANGLE's EXT_robustness behavior on Windows).

+  return error::kLostContext;
+}
+
 void GLES2DecoderImpl::RemoveBufferInfo(GLuint client_id) {
   buffer_manager()->RemoveBufferInfo(client_id);
 }
 
 bool GLES2DecoderImpl::CreateProgramHelper(GLuint client_id) {
   if (GetProgramInfo(client_id)) {
     return false;
   }
   GLuint service_id = glCreateProgram();
   if (service_id != 0) {
@@ skipping 6380 matching lines @@
       target, level, xoffset, yoffset, width, height, format, type, pixels);
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu