[Ozone-DRI] Reuse framebuffer when re-enabling CRTC

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 87 matching lines @@
   set_crtc_call_count_++;
   return set_crtc_expectation_;
 }
 
 bool MockDriWrapper::SetCrtc(drmModeCrtc* crtc,
                              std::vector<uint32_t> connectors) {
   restore_crtc_call_count_++;
   return true;
 }
 
+bool MockDriWrapper::DisableCrtc(uint32_t crtc_id) {
+  current_framebuffer_ = 0;
+  return true;
+}
+
 ScopedDrmConnectorPtr MockDriWrapper::GetConnector(uint32_t connector_id) {
   return ScopedDrmConnectorPtr(DrmAllocator<drmModeConnector>());
 }
 
 bool MockDriWrapper::AddFramebuffer(uint32_t width,
                                     uint32_t height,
                                     uint8_t depth,
                                     uint8_t bpp,
                                     uint32_t stride,
                                     uint32_t handle,
@@ skipping 86 matching lines @@
 }
 
 void MockDriWrapper::DestroyDumbBuffer(const SkImageInfo& info,
                                        uint32_t handle,
                                        uint32_t stride,
                                        void* pixels) {
   delete[] static_cast<char*>(pixels);
 }
 
 }  // namespace ui