[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/native/aw_contents_background_thread_client.h

Index: android_webview/native/aw_contents_background_thread_client.h
diff --git a/android_webview/native/aw_contents_background_thread_client.h b/android_webview/native/aw_contents_background_thread_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..7efd20d52bf4541bd96648524a954b51d100fc7a
--- /dev/null
+++ b/android_webview/native/aw_contents_background_thread_client.h
@@ -0,0 +1,30 @@
+// 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_NATIVE_AW_CONTENTS_BACKGROUND_THREAD_CLIENT_H_
+#define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_BACKGROUND_THREAD_CLIENT_H_
+
+#include "base/android/scoped_java_ref.h"
+
+namespace android_webview {
+
+class AwContentsBackgroundThreadClient {
+ public:
+  static base::android::ScopedJavaLocalRef<jobject> shouldInterceptRequest(
+      JNIEnv* env,
+      jobject obj,
+      jstring url,
+      jboolean isMainFrame,
+      jboolean hasUserGesture,
+      jstring method,
+      jobjectArray requestHeaderNames,
+      jobjectArray requestHeaderValues);
+};
+
+// JNI registration method.
+bool RegisterAwContentsBackgroundThreadClient(JNIEnv* env);
+
+}
+
+#endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_BACKGROUND_THREAD_CLIENT_H_