ozone: Fix flow control regression in ARM swap buffers code path

ui/gl/gl_surface_ozone.cc

 // Copyright 2014 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_surface.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 348 matching lines @@
 
     base::Closure fence_wait_task =
         base::Bind(&WaitForFence, GetDisplay(), fence);
 
     base::Closure fence_retired_callback =
         base::Bind(&GLSurfaceOzoneSurfaceless::FenceRetired,
                    weak_factory_.GetWeakPtr(), fence, frame);
 
     base::WorkerPool::PostTaskAndReply(FROM_HERE, fence_wait_task,
                                        fence_retired_callback, false);
-  } else if (ozone_surface_->IsUniversalDisplayLinkDevice()) {
+    return;  // Defer frame submission until fence signals.
+  }
+
+  if (ozone_surface_->IsUniversalDisplayLinkDevice())
     glFinish();
-  }
 
   frame->ready = true;
   SubmitFrame();
 }
 
 void GLSurfaceOzoneSurfaceless::PostSubBufferAsync(
     int x,
     int y,
     int width,
     int height,
@@ skipping 349 matching lines @@
   }
 }
 
 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
   return ui::OzonePlatform::GetInstance()
       ->GetSurfaceFactoryOzone()
       ->GetNativeDisplay();
 }
 
 }  // namespace gfx