[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/aw_web_resource_response.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 "android_webview/browser/aw_web_resource_response.h"
-
-#include "android_webview/browser/input_stream.h"
-#include "android_webview/browser/net/android_stream_reader_url_request_job.h"
-#include "base/strings/string_number_conversions.h"
-#include "net/http/http_response_headers.h"
-
-namespace android_webview {
-
-namespace {
-
-class StreamReaderJobDelegateImpl
-    : public AndroidStreamReaderURLRequestJob::Delegate {
- public:
-  StreamReaderJobDelegateImpl(
-      scoped_ptr<AwWebResourceResponse> aw_web_resource_response)
-      : aw_web_resource_response_(aw_web_resource_response.Pass()) {
-    DCHECK(aw_web_resource_response_);
-  }
-
-  scoped_ptr<InputStream> OpenInputStream(JNIEnv* env,
-                                          const GURL& url) override {
-    return aw_web_resource_response_->GetInputStream(env).Pass();
-  }
-
-  void OnInputStreamOpenFailed(net::URLRequest* request,
-                               bool* restart) override {
-    *restart = false;
-  }
-
-  bool GetMimeType(JNIEnv* env,
-                   net::URLRequest* request,
-                   android_webview::InputStream* stream,
-                   std::string* mime_type) override {
-    return aw_web_resource_response_->GetMimeType(env, mime_type);
-  }
-
-  bool GetCharset(JNIEnv* env,
-                  net::URLRequest* request,
-                  android_webview::InputStream* stream,
-                  std::string* charset) override {
-    return aw_web_resource_response_->GetCharset(env, charset);
-  }
-
-  void AppendResponseHeaders(JNIEnv* env,
-                             net::HttpResponseHeaders* headers) override {
-    int status_code;
-    std::string reason_phrase;
-    if (aw_web_resource_response_->GetStatusInfo(
-            env, &status_code, &reason_phrase)) {
-      std::string status_line("HTTP/1.1 ");
-      status_line.append(base::IntToString(status_code));
-      status_line.append(" ");
-      status_line.append(reason_phrase);
-      headers->ReplaceStatusLine(status_line);
-    }
-    aw_web_resource_response_->GetResponseHeaders(env, headers);
-  }
-
- private:
-  scoped_ptr<AwWebResourceResponse> aw_web_resource_response_;
-};
-
-}  // namespace
-
-// static
-net::URLRequestJob* AwWebResourceResponse::CreateJobFor(
-    scoped_ptr<AwWebResourceResponse> aw_web_resource_response,
-    net::URLRequest* request,
-    net::NetworkDelegate* network_delegate) {
-  DCHECK(aw_web_resource_response);
-  DCHECK(request);
-  DCHECK(network_delegate);
-
-  return new AndroidStreamReaderURLRequestJob(
-      request,
-      network_delegate,
-      make_scoped_ptr(
-          new StreamReaderJobDelegateImpl(aw_web_resource_response.Pass())));
-}
-
-}  // namespace android_webview