gpu: Add async upload functions.

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 a0c7b5661bcb7f5036cb86ce8ac41184a34d712f..1983262fa6fd36a501ef569c245ab2fda40096de 100644
--- a/gpu/command_buffer/client/query_tracker.cc
+++ b/gpu/command_buffer/client/query_tracker.cc
@@ -83,6 +83,10 @@ void QueryTracker::Query::Begin(GLES2Implementation* gl) {
       // tell service about id, shared memory and count
       gl->helper()->BeginQueryEXT(target(), id(), shm_id(), shm_offset());
       break;
+    case GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM:
+      // tell service about id, shared memory and count
+      gl->helper()->BeginQueryEXT(target(), id(), shm_id(), shm_offset());
+      break;
     default:
       // tell service about id, shared memory and count
       gl->helper()->BeginQueryEXT(target(), id(), shm_id(), shm_offset());
@@ -131,6 +135,9 @@ bool QueryTracker::Query::CheckResultsAvailable(
           result_ = std::min(info_.sync->result - client_begin_time_us_,
                              static_cast<uint64>(0xFFFFFFFFL));
           break;
+        case GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM:
+          result_ = info_.sync->result;
+          break;
         default:
           result_ = info_.sync->result;
           break;