[Night Light] Backend ui::Layer work

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index a97525d03f1064451efea4386ec45f024d7dd408..89602807c8cfc58626b3b81f10f9e7de684fc8e4 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -186,6 +186,11 @@ class COMPOSITOR_EXPORT Layer
   // the combined opacity of the parent.
   float GetCombinedOpacity() const;
 
+  // The layer temperature value between 0.0f and 1.0f, where a value of 0.0f
+  // is least warm (which is the default), and a value of 1.0f is most warm.
+  float layer_temperature() const { return layer_temperature_; }
+  void SetLayerTemperature(float value);
+
   // Blur pixels by this amount in anything below the layer and visible through
   // the layer.
   int background_blur() const { return background_blur_radius_; }
@@ -421,6 +426,7 @@ class COMPOSITOR_EXPORT Layer
   void SetBrightnessFromAnimation(float brightness) override;
   void SetGrayscaleFromAnimation(float grayscale) override;
   void SetColorFromAnimation(SkColor color) override;
+  void SetTemperatureFromAnimation(float temperature) override;
   void ScheduleDrawForAnimation() override;
   const gfx::Rect& GetBoundsForAnimation() const override;
   gfx::Transform GetTransformForAnimation() const override;
@@ -429,6 +435,7 @@ class COMPOSITOR_EXPORT Layer
   float GetBrightnessForAnimation() const override;
   float GetGrayscaleForAnimation() const override;
   SkColor GetColorForAnimation() const override;
+  float GetTemperatureFromAnimation() const override;
   float GetDeviceScaleFactor() const override;
   cc::Layer* GetCcLayer() const override;
   LayerThreadedAnimationDelegate* GetThreadedAnimationDelegate() override;
@@ -499,6 +506,14 @@ class COMPOSITOR_EXPORT Layer
   float layer_grayscale_;
   bool layer_inverted_;
 
+  // The global color temperature value (0.0f ~ 1.0f). Used to calculate the
+  // layer blue and green colors scales. 0.0f is least warm (default), and 1.0f
+  // is most warm.
+  float layer_temperature_;
+  // The calculated layer blue and green color scales (0.0f ~ 1.0f).
+  float layer_blue_scale_;
+  float layer_green_scale_;
+
   // The associated mask layer with this layer.
   Layer* layer_mask_;
   // The back link from the mask layer to it's associated masked layer.