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

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

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 142 matching lines @@
 
   virtual bool UnmapDumbBuffer(void* pixels, size_t size);
 
   virtual bool CloseBufferHandle(uint32_t handle);
 
   virtual bool CommitProperties(drmModeAtomicReq* properties,
                                 uint32_t flags,
                                 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,
       const std::vector<GammaRampRGBEntry>& gamma_lut,
       const std::vector<float>& correction_matrix);
 
   virtual bool SetCapability(uint64_t capability, uint64_t value);
 
   // Drm master related
   virtual bool SetMaster();
   virtual bool DropMaster();
 
   int get_fd() const { return file_.GetPlatformFile(); }
 
   base::FilePath device_path() const { return device_path_; }
 
   HardwareDisplayPlaneManager* plane_manager() { return plane_manager_.get(); }
 
  protected:
   friend class base::RefCountedThreadSafe<DrmDevice>;
 
   virtual ~DrmDevice();
 
   std::unique_ptr<HardwareDisplayPlaneManager> plane_manager_;
 
  private:
   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_;
 
   // DRM device.
   base::File file_;
 
   std::unique_ptr<PageFlipManager> page_flip_manager_;
 
   // Watcher for |fd_| listening for page flip events.
   std::unique_ptr<IOWatcher> watcher_;
 
   bool is_primary_device_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDevice);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_