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 3489a7ffab4ab6cdedbad908c2f99e2c20fed2a0..26cfbfd1f553a71d2142c3162d5a62dea2c46c47 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
@@ -246,6 +246,12 @@ public class ContentViewCore
          * started.
          */
         public void addEnteringStylesheetToTransition(String stylesheet);
+
+        /**
+         * 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;
@@ -3018,6 +3024,13 @@ 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();