Navigation transitions: Block first response until after transitions have run.

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 9a3bf0c67c75a39fd5c943b2f7b8ccba64cf0d29..e9c4e8140b47bc7fc7ec27a0c57268fc138740c2 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
@@ -3058,6 +3058,16 @@ public class ContentViewCore
         sendOrientationChangeEvent(orientation);
     }
 
+    public void setHasPendingTransitionRequest(boolean hasPendingTransition) {
+        if (mNativeContentViewCore == 0) return;
+        nativeSetHasPendingTransitionRequest(mNativeContentViewCore, hasPendingTransition);
+    }
+
+    public void resumeResponseDeferredAtStart() {
+        if (mNativeContentViewCore == 0) return;
+        nativeResumeResponseDeferredAtStart(mNativeContentViewCore);
+    }
+
     private native WebContents nativeGetWebContentsAndroid(long nativeContentViewCoreImpl);
 
     private native void nativeOnJavaContentViewCoreDestroyed(long nativeContentViewCoreImpl);
@@ -3211,4 +3221,10 @@ public class ContentViewCore
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
+
+    private native void nativeResumeResponseDeferredAtStart(
+            long nativeContentViewCoreImpl);
+
+    private native void nativeSetHasPendingTransitionRequest(
+            long nativeContentViewCoreImpl, boolean hasPendingTransition);
 }