Add a command to lose the context

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 3fc39c6dda1c29f787f7a8648d00baa58d85d481..6330cf2aa591c50a741df57dbe80d786abff7161 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3343,6 +3343,15 @@ error::Error GLES2DecoderImpl::DoCommand(
   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);
 }