Created a new BrowserMessageFilter to handle print related IPC messages.

chrome/browser/printing/printing_message_filter.h

Index: chrome/browser/printing/printing_message_filter.h
diff --git a/chrome/browser/printing/printing_message_filter.h b/chrome/browser/printing/printing_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..6a41742a37bbbeb1f0f5dded77f5557d166e8027
--- /dev/null
+++ b/chrome/browser/printing/printing_message_filter.h
@@ -0,0 +1,76 @@
+// Copyright (c) 2011 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 CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
+#define CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
+#pragma once
+
+#include "chrome/browser/browser_message_filter.h"
+
+#if defined(OS_WIN)
+#include "base/shared_memory.h"
+#endif
+
+struct ViewHostMsg_ScriptedPrint_Params;
+
+namespace printing {
+class PrinterQuery;
+class PrintJobManager;
+}
+
+// This class filters out incoming printing related IPC messages for the
+// renderer process on the IPC thread.
+class PrintingMessageFilter : public BrowserMessageFilter {
+ public:
+  PrintingMessageFilter();
+
+  // BrowserMessageFilter methods.
+  virtual void OverrideThreadForMessage(const IPC::Message& message,
+                                        BrowserThread::ID* thread);
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok);
+
+ private:
+  virtual ~PrintingMessageFilter();
+
+#if defined(OS_WIN)
+  // Used to pass resulting EMF from renderer to browser in printing.
+  void OnDuplicateSection(base::SharedMemoryHandle renderer_handle,
+                          base::SharedMemoryHandle* browser_handle);
+#endif
+
+#if defined(OS_CHROMEOS)
+  // Used to ask the browser allocate a temporary file for the renderer
+  // to fill in resulting PDF in renderer.
+  void OnAllocateTempFileForPrinting(base::FileDescriptor* temp_file_fd,
+                                     int* sequence_number);
+  void OnTempFileForPrintingWritten(int sequence_number);
+#endif
+
+  // A javascript code requested to print the current page. This is done in two
+  // steps and this is the first step. Get the print setting right here
+  // synchronously. It will hang the I/O completely.
+  void OnGetDefaultPrintSettings(IPC::Message* reply_msg);
+  void OnGetDefaultPrintSettingsReply(
+      scoped_refptr<printing::PrinterQuery> printer_query,
+      IPC::Message* reply_msg);
+
+  // A javascript code requested to print the current page. The renderer host
+  // have to show to the user the print dialog and returns the selected print
+  // settings.
+  void OnScriptedPrint(const ViewHostMsg_ScriptedPrint_Params& params,
+                       IPC::Message* reply_msg);
+  void OnScriptedPrintReply(
+      scoped_refptr<printing::PrinterQuery> printer_query,
+      int routing_id,
+      IPC::Message* reply_msg);
+
+  printing::PrintJobManager* print_job_manager_;
+
+  bool cloud_print_enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintingMessageFilter);
+};
+
+#endif  // CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_