Implement OverlayPanels as SceneOverlays

chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java
index 5cb0981d0294cb60e993e44ce0d31eb5fbe418ab..6e4f3b511c221c830d2349e7f705e2f8147d2c78 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java
@@ -27,18 +27,6 @@ public class TabListSceneLayer extends SceneLayer {
     private long mNativePtr;
 
     /**
-     * Sets a content tree inside this scene overlay tree.
-     *
-     * TODO(changwan): use SceneOverlayTree's setContentTree() once we have refactored
-     * ContextualSearchSupportedLayout into LayoutHelper.
-     *
-     * @param contentTree A content tree.
-     */
-    public void setContentTree(SceneLayer contentTree) {
-        nativeSetContentTree(mNativePtr, contentTree);
-    }
-
-    /**
      * Pushes all relevant {@link LayoutTab}s from a {@link Layout} to the CC Layer tree.  This will
      * let them be rendered on the screen.  This should only be called when the Compositor has
      * disabled ScheduleComposite calls as this will change the tree and could subsequently cause
@@ -128,7 +116,6 @@ public class TabListSceneLayer extends SceneLayer {
     }
 
     private native long nativeInit();
-    private native void nativeSetContentTree(long nativeTabListSceneLayer, SceneLayer contentTree);
     private native void nativeBeginBuildingFrame(long nativeTabListSceneLayer);
     private native void nativeFinishBuildingFrame(long nativeTabListSceneLayer);
     private native void nativeUpdateLayer(long nativeTabListSceneLayer, int backgroundColor,