The Java Client should be aware of the readback status.

content/browser/android/content_readback_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/android/content_readback_handler.h"
 
 #include "base/android/jni_android.h"
 #include "base/bind.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
@@ skipping 93 matching lines @@
 
 void ContentReadbackHandler::OnFinishReadback(int readback_id,
                                               const SkBitmap& bitmap,
                                               ReadbackResponse response) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> java_bitmap;
   if (response == READBACK_SUCCESS)
     java_bitmap = gfx::ConvertToJavaBitmap(&bitmap);
 
   Java_ContentReadbackHandler_notifyGetBitmapFinished(
-      env, java_obj_.obj(), readback_id, java_bitmap.obj());
+      env, java_obj_.obj(), readback_id, java_bitmap.obj(), response);
 }
 
 // static
 static jlong Init(JNIEnv* env, jobject obj) {
   ContentReadbackHandler* content_readback_handler =
       new ContentReadbackHandler(env, obj);
   return reinterpret_cast<intptr_t>(content_readback_handler);
 }
 
 }  // namespace content