Revert of ash: reset color management when new screens are hotplugged

ui/ozone/platform/drm/gpu/mock_drm_device.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/drm/gpu/mock_drm_device.h"
 
 #include <xf86drm.h>
 
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 206 matching lines @@
   return true;
 }
 
 bool MockDrmDevice::CommitProperties(drmModeAtomicReq* properties,
                                      uint32_t flags,
                                      uint32_t crtc_count,
                                      const PageFlipCallback& callback) {
   return false;
 }
 
+bool MockDrmDevice::SetGammaRamp(uint32_t crtc_id,
+                                 const std::vector<GammaRampRGBEntry>& lut) {
+  return true;
+}
+
 bool MockDrmDevice::SetColorCorrection(
     uint32_t crtc_id,
     const std::vector<GammaRampRGBEntry>& degamma_lut,
     const std::vector<GammaRampRGBEntry>& gamma_lut,
     const std::vector<float>& correction_matrix) {
   return true;
 }
 
 bool MockDrmDevice::SetCapability(uint64_t capability, uint64_t value) {
   return false;
 }
 
 void MockDrmDevice::RunCallbacks() {
   while (!callbacks_.empty()) {
     PageFlipCallback callback = callbacks_.front();
     callbacks_.pop();
     callback.Run(0, 0, 0);
   }
 }
 
 }  // namespace ui