Flush errors when destroying a passthrough command decoder.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

 // Copyright (c) 2016 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_passthrough.h"
 
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "ui/gl/gl_version_info.h"
 
@@ skipping 190 matching lines @@
   if (group_->gpu_preferences().enable_gpu_driver_debug_logging &&
       feature_info_->feature_flags().khr_debug) {
     InitializeGLDebugLogging();
   }
 
   set_initialized();
   return true;
 }
 
 void GLES2DecoderPassthroughImpl::Destroy(bool have_context) {
+  if (have_context) {
+    FlushErrors();
+  }
+
   image_manager_.reset();
 
   DeleteServiceObjects(
       &framebuffer_id_map_, have_context,
       [](GLuint framebuffer) { glDeleteFramebuffersEXT(1, &framebuffer); });
   DeleteServiceObjects(&transform_feedback_id_map_, have_context,
                        [](GLuint transform_feedback) {
                          glDeleteTransformFeedbacks(1, &transform_feedback);
                        });
   DeleteServiceObjects(&query_id_map_, have_context,
@@ skipping 628 matching lines @@
   }, /* NOLINT */
 
 const GLES2DecoderPassthroughImpl::CommandInfo
     GLES2DecoderPassthroughImpl::command_info[] = {
         GLES2_COMMAND_LIST(GLES2_CMD_OP)};
 
 #undef GLES2_CMD_OP
 
 }  // namespace gles2
 }  // namespace gpu