[Ozone-Dri] Decouple the IO helper thread from DriWrapper

ui/ozone/platform/dri/test/mock_dri_wrapper.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/ozone/platform/dri/test/mock_dri_wrapper.h"
 
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 
 #include "base/logging.h"
@@ skipping 22 matching lines @@
         planes_.push_back(
             new HardwareDisplayPlane(kPlaneBaseId + i, 1 << crtc_idx));
       }
     }
   }
 };
 
 }  // namespace
 
 MockDriWrapper::MockDriWrapper(int fd)
-    : DriWrapper("", true),
+    : DriWrapper("", nullptr),
       get_crtc_call_count_(0),
       set_crtc_call_count_(0),
       restore_crtc_call_count_(0),
       add_framebuffer_call_count_(0),
       remove_framebuffer_call_count_(0),
       page_flip_call_count_(0),
       overlay_flip_call_count_(0),
       set_crtc_expectation_(true),
       add_framebuffer_expectation_(true),
       page_flip_expectation_(true),
       create_dumb_buffer_expectation_(true),
       current_framebuffer_(0) {
   fd_ = fd;
   plane_manager_.reset(new HardwareDisplayPlaneManagerLegacy());
 }
 
 MockDriWrapper::MockDriWrapper(int fd,
                                bool use_sync_flips,
                                std::vector<uint32_t> crtcs,
                                size_t planes_per_crtc)
-    : DriWrapper("", use_sync_flips),
+    : DriWrapper("", nullptr),
       get_crtc_call_count_(0),
       set_crtc_call_count_(0),
       restore_crtc_call_count_(0),
       add_framebuffer_call_count_(0),
       remove_framebuffer_call_count_(0),
       page_flip_call_count_(0),
       overlay_flip_call_count_(0),
       set_crtc_expectation_(true),
       add_framebuffer_expectation_(true),
       page_flip_expectation_(true),
       create_dumb_buffer_expectation_(true),
+      use_sync_flips_(use_sync_flips),
       current_framebuffer_(0) {
   fd_ = fd;
   plane_manager_.reset(
       new MockHardwareDisplayPlaneManager(this, crtcs, planes_per_crtc));
 }
 
 MockDriWrapper::~MockDriWrapper() {
   fd_ = -1;
 }
 
@@ skipping 128 matching lines @@
 
 void MockDriWrapper::RunCallbacks() {
   while (!callbacks_.empty()) {
     PageFlipCallback callback = callbacks_.front();
     callbacks_.pop();
     callback.Run(0, 0, 0);
   }
 }
 
 }  // namespace ui