Add methods to SceneOverlay interface

chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java
index a03e4f8e9c998edc04b740de4ceb252b1bdb7d20..4995334b4b349c342501de320ce94d952d4f5317 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelperManager.java
@@ -257,6 +257,19 @@ public class StripLayoutHelperManager implements SceneOverlay {
     }
 
     @Override
+    public boolean onBackPressed() {
+        return false;
+    }
+
+    @Override
+    public void onHideLayout() {}
+
+    @Override
+    public boolean handlesTabCreating() {
+        return false;
+    }
+
+    @Override
     public void tabStateInitialized() {
         updateModelSwitcherButton();
     }