Navigation transitions (web to native app): Pass data after starting provisional load (Chrome side)

content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java

Index: content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java b/content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java
index d719b4325c4704e1f091a13a7006915f5bb5c4a3..31fbfe1eda86d5d0a43d7daa25321a5fed64a34b 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/NavigationTransitionDelegate.java
@@ -37,6 +37,18 @@ public interface NavigationTransitionDelegate {
     /**
      * Notifies that a navigation transition is started for a given frame.
      * @param frameId A positive, non-zero integer identifying the navigating frame.
+     * @param cssSelector The CSS selector, which is to be used by Activity Transitions
+     *                    or applied to the transition layer's markup later.
      */
-    public void didStartNavigationTransitionForFrame(long frameId);
+    public void didStartNavigationTransitionForFrame(long frameId, String cssSelector);
+
+    /**
+     * Add transition element's name, position and size.
+     * @param name The name of the transition element.
+     * @param x The x position of the transition element.
+     * @param y The y position of the transition element.
+     * @param width The width of the transition element.
+     * @param height The height of the transition element.
+     */
+    public void addNavigationTransitionElements(String name, int x, int y, int width, int height);
 }