gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/service/query_manager.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_
 
 #include <deque>
 #include <vector>
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 
 class GLES2Decoder;
 
 namespace gles2 {
 
 class FeatureInfo;
 
 // This class keeps track of the queries and their state
 // As Queries are not shared there is one QueryManager per context.
-class GPU_EXPORT QueryManager {
+class GPU_EXPORT QueryManager : public base::SupportsWeakPtr<QueryManager> {
  public:
   class GPU_EXPORT Query : public base::RefCounted<Query> {
    public:
     Query(
         QueryManager* manager, GLenum target, int32 shm_id, uint32 shm_offset);
 
     GLenum target() const {
       return target_;
     }
 
@@ skipping 10 matching lines @@
     }
 
     int32 shm_id() const {
       return shm_id_;
     }
 
     uint32 shm_offset() const {
       return shm_offset_;
     }
 
+    void set_serial(uint32 serial) {
+      serial_ = serial;
+    }
+
+    uint32 serial() const {
+      return serial_;
+    }
+
     // Returns false if shared memory for sync is invalid.
     virtual bool Begin() = 0;
 
     // Returns false if shared memory for sync is invalid.
     virtual bool End(uint32 submit_count) = 0;
 
     // Returns false if shared memory for sync is invalid.
     virtual bool Process() = 0;
 
     virtual void Destroy(bool have_context) = 0;
@@ skipping 66 matching lines @@
 
     // Count to set process count do when completed.
     uint32 submit_count_;
 
     // True if in the queue.
     bool pending_;
 
     // True if deleted.
     bool deleted_;
 
+    uint32 serial_;
+
     // List of callbacks to run when result is available.
     std::vector<base::Closure> callbacks_;
   };
 
   QueryManager(
       GLES2Decoder* decoder,
       FeatureInfo* feature_info);
   ~QueryManager();
 
   // Must call before destruction.
@@ skipping 79 matching lines @@
   // Async pixel transfer queries waiting for completion.
   QueryQueue pending_transfer_queries_;
 
   DISALLOW_COPY_AND_ASSIGN(QueryManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_