Add more strict DCHECKs around context state.

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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 5221 matching lines @@
 // NOTE: 'buffer' is a pointer to the command buffer. As such, it could be
 // changed by a (malicious) client at any time, so if validation has to happen,
 // it should operate on a copy of them.
 // NOTE: This is duplicating code from AsyncAPIInterface::DoCommands() in the
 // interest of performance in this critical execution loop.
 template <bool DebugImpl>
 error::Error GLES2DecoderImpl::DoCommandsImpl(unsigned int num_commands,
                                               const volatile void* buffer,
                                               int num_entries,
                                               int* entries_processed) {
+  DCHECK(context_->IsCurrent(surface_.get()));
   commands_to_process_ = num_commands;
   error::Error result = error::kNoError;
   const volatile CommandBufferEntry* cmd_data =
       static_cast<const volatile CommandBufferEntry*>(buffer);
   int process_pos = 0;
   unsigned int command = 0;
 
   while (process_pos < num_entries && result == error::kNoError &&
          commands_to_process_--) {
     const unsigned int size = cmd_data->value_header.size;
@@ skipping 14384 matching lines @@
 }
 
 // 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 "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu