Navigation transitions: Pass is_transition_navigation flag up to the embedder

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index cc03f07afb6cb69518eafded59c9f2841968dda9..f3316e8b9e4988ad671e1c2b3184f8d9f2da329b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -229,6 +229,12 @@ public class ContentViewCore
          * if it's supported.
          */
         public boolean willHandleDeferAfterResponseStarted();
+
+        /**
+         * Notifies that a navigation transition is started for a given frame.
+         * @param frameId A positive, non-zero integer identifying the navigating frame.
+         */
+        public void didStartNavigationTransitionForFrame(long frameId);
     }
 
     private final Context mContext;
@@ -3089,6 +3095,13 @@ public class ContentViewCore
     }
 
     @CalledByNative
+    public void didStartNavigationTransitionForFrame(long frameId) {
+        if (mNavigationTransitionDelegate != null ) {
+            mNavigationTransitionDelegate.didStartNavigationTransitionForFrame(frameId);
+        }
+    }
+
+    @CalledByNative
     private boolean willHandleDeferAfterResponseStarted() {
         if (mNavigationTransitionDelegate == null) return false;
         return mNavigationTransitionDelegate.willHandleDeferAfterResponseStarted();