Implement OverlayPanels as SceneOverlays

chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h

Index: chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h
diff --git a/chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h b/chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h
index 13caf6d67c99d4fa8d7943210ca7eb2073505f85..49674e2b27b6ce53d26aae42c91078e635c000f4 100644
--- a/chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h
+++ b/chrome/browser/android/compositor/scene_layer/reader_mode_scene_layer.h
@@ -15,6 +15,11 @@
 #include "chrome/browser/android/compositor/scene_layer/scene_layer.h"
 #include "ui/android/resources/resource_manager_impl.h"
 
+namespace cc {
+class Layer;
+class SolidColorLayer;
+}
+
 namespace chrome {
 namespace android {
 
@@ -43,6 +48,8 @@ class ReaderModeSceneLayer : public SceneLayer {
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object,
       jfloat dp_to_px,
+      jfloat base_page_brightness,
+      jfloat base_page_offset,
       const base::android::JavaParamRef<jobject>& jcontent_view_core,
       jfloat panel_X,
       jfloat panel_y,
@@ -56,8 +63,22 @@ class ReaderModeSceneLayer : public SceneLayer {
       jboolean bar_shadow_visible,
       jfloat bar_shadow_opacity);
 
+  void SetContentTree(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jobj,
+      const base::android::JavaParamRef<jobject>& jcontent_tree);
+
+  void HideTree(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& jobj);
+
  private:
+  float base_page_brightness_;
+
+  scoped_refptr<cc::Layer> content_layer_;
   scoped_refptr<ReaderModeLayer> reader_mode_layer_;
+  scoped_refptr<cc::SolidColorLayer> color_overlay_;
+  scoped_refptr<cc::Layer> content_container_;
 
   DISALLOW_COPY_AND_ASSIGN(ReaderModeSceneLayer);
 };