Adjust Query code to handle context lost

gpu/command_buffer/client/query_tracker.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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "../client/query_tracker.h"
 
 #include "../client/atomicops.h"
@@ skipping 133 matching lines @@
   GPU_DCHECK(result.second);
   return query;
 }
 
 QueryTracker::Query* QueryTracker::GetQuery(
     GLuint client_id) {
   QueryMap::iterator it = queries_.find(client_id);
   return it != queries_.end() ? it->second : NULL;
 }
 
-void QueryTracker::RemoveQuery(GLuint client_id) {
+void QueryTracker::RemoveQuery(GLuint client_id, bool context_lost) {
+  (void)context_lost;  // stop unused warning
   QueryMap::iterator it = queries_.find(client_id);
   if (it != queries_.end()) {
     Query* query = it->second;
-    GPU_DCHECK(!query->Pending());
+    GPU_DCHECK(context_lost || !query->Pending());
     query_sync_manager_.Free(query->info_);
     queries_.erase(it);
     delete query;
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu