Reland: ash: reset color management when new screens are hotplugged

ui/ozone/platform/drm/gpu/drm_device.h

Index: ui/ozone/platform/drm/gpu/drm_device.h
diff --git a/ui/ozone/platform/drm/gpu/drm_device.h b/ui/ozone/platform/drm/gpu/drm_device.h
index d0fb14d59fb04b81786a927f57066072d7c2dd21..b11167c46a5e0cd9bf30dc45552ea0b5785a598b 100644
--- a/ui/ozone/platform/drm/gpu/drm_device.h
+++ b/ui/ozone/platform/drm/gpu/drm_device.h
@@ -160,9 +160,6 @@ class DrmDevice : public base::RefCountedThreadSafe<DrmDevice> {
                                 uint32_t crtc_count,
                                 const PageFlipCallback& callback);
 
-  // Set the gamma ramp for |crtc_id| to reflect the ramps in |lut|.
-  virtual bool SetGammaRamp(uint32_t crtc_id,
-                            const std::vector<GammaRampRGBEntry>& lut);
   virtual bool SetColorCorrection(
       uint32_t crtc_id,
       const std::vector<GammaRampRGBEntry>& degamma_lut,
@@ -192,6 +189,9 @@ class DrmDevice : public base::RefCountedThreadSafe<DrmDevice> {
   class IOWatcher;
   class PageFlipManager;
 
+  bool SetGammaRamp(uint32_t crtc_id,
+                    const std::vector<GammaRampRGBEntry>& lut);
+
   // Path to the DRM device (in sysfs).
   const base::FilePath device_path_;