gpu: Add ARB_occlusion_query support.

gpu/command_buffer/service/query_manager.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/query_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/atomicops.h"
@@ skipping 785 matching lines @@
     case GL_TIMESTAMP:
       query = new TimeStampQuery(this, target, shm_id, shm_offset);
       break;
     case GL_ANY_SAMPLES_PASSED:
     case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
       query = new BooleanQuery(this, target, shm_id, shm_offset);
       break;
     case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
       query = new SummedIntegerQuery(this, target, shm_id, shm_offset);
       break;
+    case GL_SAMPLES_PASSED:
+      query = new SummedIntegerQuery(this, target, shm_id, shm_offset);
+      break;
     default: {
       NOTREACHED();
     }
   }
   std::pair<QueryMap::iterator, bool> result =
       queries_.insert(std::make_pair(client_id, query));
   DCHECK(result.second);
   return query.get();
 }
 
@@ skipping 316 matching lines @@
   for (std::pair<const GLenum, scoped_refptr<Query> >& it : active_queries_) {
     if (it.second->IsPaused()) {
       it.second->Resume();
       DCHECK(it.second->IsActive());
     }
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu