[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/aw_request_handler.h

Index: android_webview/browser/aw_request_handler.h
diff --git a/android_webview/browser/aw_request_handler.h b/android_webview/browser/aw_request_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..fe8f5a23459408ba180e6645a827cb18963daded
--- /dev/null
+++ b/android_webview/browser/aw_request_handler.h
@@ -0,0 +1,45 @@
+// Copyright 2015 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.
+
+#ifndef ANDROID_WEBVIEW_BROWSER_AW_REQUEST_HANDLER_H_
+#define ANDROID_WEBVIEW_BROWSER_AW_REQUEST_HANDLER_H_
+
+#include "android_webview/browser/net/android_stream_reader_url_request_job.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace net {
+class URLRequest;
+class URLRequestJob;
+class NetworkDelegate;
+}
+
+namespace android_webview {
+
+class AwWebResourceResponse;
+
+class AwRequestHandler : public base::RefCountedThreadSafe<AwRequestHandler> {

[boliu, 2015/09/28 23:26:28]

Is this refcounted only because of UserDataAdapter? In that case I think it
doesn't need to be thread safe?

[mnaganov (inactive), 2015/09/29 00:14:06]

Also because it binds QueryForAwWebResourceResponseDone to itself in order to
pass it to ShouldInterceptRequestAsync. But yes, as the callback is only used on
the IO thread, it doesn't need to be "ThreadSafe".

+ public:
+  AwRequestHandler();
+
+  AndroidStreamReaderURLRequestJob* MaybeInterceptRequest(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate);
+
+ private:
+  friend class base::RefCountedThreadSafe<AwRequestHandler>;
+
+  ~AwRequestHandler();
+  bool QueryForAwWebResourceResponse(net::URLRequest* request);
+  void QueryForAwWebResourceResponseDone(
+      scoped_ptr<AwWebResourceResponse> response);
+
+  scoped_refptr<AndroidStreamReaderURLRequestJob> job_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwRequestHandler);
+};
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_AW_REQUEST_HANDLER_H_