Remove the discrepencies between chrome and android_webview print

android_webview/browser/aw_printing_message_filter.h

Index: android_webview/browser/aw_printing_message_filter.h
diff --git a/android_webview/browser/aw_printing_message_filter.h b/android_webview/browser/aw_printing_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..dac654804d68b711ab892556310cdc2b52ebf5b3
--- /dev/null
+++ b/android_webview/browser/aw_printing_message_filter.h
@@ -0,0 +1,40 @@
+// 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_PRINTING_MESSAGE_FILTER_H_
+#define ANDROID_WEBVIEW_BROWSER_PRINTING_MESSAGE_FILTER_H_
+
+#include "content/public/browser/browser_message_filter.h"
+
+namespace android_webview {
+
+// This class filters out incoming printing related IPC messages for the
+// renderer process on the IPC thread.
+class AwPrintingMessageFilter : public content::BrowserMessageFilter {
+ public:
+  AwPrintingMessageFilter(int render_process_id);
+
+  // content::BrowserMessageFilter methods.
+  void OverrideThreadForMessage(const IPC::Message& message,
+                                content::BrowserThread::ID* thread) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+ private:
+  ~AwPrintingMessageFilter() override;
+
+  // Used to ask the browser allocate a temporary file for the renderer
+  // to fill in resulting PDF in renderer.
+  void OnAllocateTempFileForPrinting(int render_view_id,
+                                     base::FileDescriptor* temp_file_fd,
+                                     int* sequence_number);
+  void OnTempFileForPrintingWritten(int render_view_id, int sequence_number);
+
+  const int render_process_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwPrintingMessageFilter);
+};
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_PRINTING_MESSAGE_FILTER_H_