[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/net/android_stream_reader_url_request_job.h

Index: android_webview/browser/net/android_stream_reader_url_request_job.h
diff --git a/android_webview/browser/net/android_stream_reader_url_request_job.h b/android_webview/browser/net/android_stream_reader_url_request_job.h
index e2049edc3b8665a0d31f8ec531493c2648d00f28..dd5d036f7f74ef925faedf2726d82828cf4a7ede 100644
--- a/android_webview/browser/net/android_stream_reader_url_request_job.h
+++ b/android_webview/browser/net/android_stream_reader_url_request_job.h
@@ -74,8 +74,14 @@ class AndroidStreamReaderURLRequestJob : public net::URLRequestJob {
 
   AndroidStreamReaderURLRequestJob(
       net::URLRequest* request,
+      net::NetworkDelegate* network_delegate);
+   AndroidStreamReaderURLRequestJob(
+      net::URLRequest* request,
       net::NetworkDelegate* network_delegate,
       scoped_ptr<Delegate> delegate);
+  void DeliverResponseFromDelegate(scoped_ptr<Delegate> delegate);
+  void DeliverResponseFromNetwork();
+  void MaybeStart();
 
   // URLRequestJob:
   void Start() override;
@@ -108,11 +114,16 @@ class AndroidStreamReaderURLRequestJob : public net::URLRequestJob {
   void OnReaderSeekCompleted(int content_size);
   void OnReaderReadCompleted(int bytes_read);
 
+  bool has_been_started() { return has_been_started_; }
+  bool has_been_killed() { return has_been_killed_; }
+
   net::HttpByteRange byte_range_;
   scoped_ptr<net::HttpResponseInfo> response_info_;
   scoped_ptr<Delegate> delegate_;
   scoped_refptr<InputStreamReaderWrapper> input_stream_reader_wrapper_;
   base::ThreadChecker thread_checker_;
+  bool has_been_started_;
+  bool has_been_killed_;
 
   base::WeakPtrFactory<AndroidStreamReaderURLRequestJob> weak_factory_;