gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/query_tracker.cc

Index: gpu/command_buffer/client/query_tracker.cc
diff --git a/gpu/command_buffer/client/query_tracker.cc b/gpu/command_buffer/client/query_tracker.cc
index 285560590b34a403ba5e2abb763d8c9d340ffc8d..4135a295a547b839d3d7d8ff277fb2e6f5eb1a21 100644
--- a/gpu/command_buffer/client/query_tracker.cc
+++ b/gpu/command_buffer/client/query_tracker.cc
@@ -112,6 +112,7 @@ void QueryTracker::Query::Begin(GLES2Implementation* gl) {
       gl->helper()->BeginQueryEXT(target(), id(), shm_id(), shm_offset());
       break;
     case GL_ASYNC_PIXEL_UNPACK_COMPLETED_CHROMIUM:
+    case GL_ASYNC_PIXEL_UNPACK_COMPLETED_PRIVATE_CHROMIUM:
     case GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM:
     default:
       // tell service about id, shared memory and count
@@ -162,6 +163,7 @@ bool QueryTracker::Query::CheckResultsAvailable(
                              static_cast<uint64>(0xFFFFFFFFL));
           break;
         case GL_ASYNC_PIXEL_UNPACK_COMPLETED_CHROMIUM:
+        case GL_ASYNC_PIXEL_UNPACK_COMPLETED_PRIVATE_CHROMIUM:
         case GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM:
         default:
           result_ = info_.sync->result;