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

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index 8ebd453002a0571207f6edb87e0190209d9bf650..2e0e34cac0c222ef1dd0e11fb00c3314b1b0a803 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -218,12 +218,24 @@ class ContentViewCoreImpl : public ContentViewCore,
                             jint width,
                             jint height);
 
+  // Notifies the main frame that it can continue navigation (if it was deferred
+  // immediately at first response).
+  void ResumeResponseDeferredAtStart(JNIEnv* env, jobject obj);
+
   jint GetCurrentRenderProcessId(JNIEnv* env, jobject obj);
 
   // --------------------------------------------------------------------------
   // Public methods that call to Java via JNI
   // --------------------------------------------------------------------------
 
+  // This method is invoked when the request is deferred immediately after
+  // receiving response headers.
+  void DidDeferAfterResponseStarted();
+
+  // This method is invoked when a navigation transition is detected, to
+  // determine if the embedder intends to handle it.
+  bool WillHandleDeferAfterResponseStarted();
+
   void OnSmartClipDataExtracted(const base::string16& result);
 
   // Creates a popup menu with |items|.