Reuse GLFenceNV when an existing CommandsCompletedQuery is reused

ui/gl/gl_fence.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 "ui/gl/gl_fence.h"
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
@@ skipping 46 matching lines @@
     fence.reset(new GLFenceEGL);
 #endif
   } else if (g_driver_gl.ext.b_GL_NV_fence) {
     fence.reset(new GLFenceNV);
   }
 
   DCHECK_EQ(!!fence.get(), GLFence::IsSupported());
   return fence.release();
 }
 
+bool GLFence::ResetSupported() {
+  // Resetting a fence to its original state isn't supported by default.
+  return false;
+}
+
+void GLFence::ResetState() {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace gfx