Created a new BrowserMessageFilter to handle print related IPC messages.

chrome/browser/renderer_host/browser_render_process_host.cc

 // 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 70 matching lines @@
 #include "chrome/common/logging_chrome.h"
 #include "chrome/common/net/url_request_context_getter.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/process_watcher.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
 #include "chrome/common/result_codes.h"
 #include "chrome/renderer/render_process_impl.h"
 #include "chrome/renderer/render_thread.h"
+#include "content/browser/renderer_host/printing_message_filter.h"

[kmadhusu, 2011/02/21 21:30:04]

jam: Do I need a dummy file
"chrome/browser/renderer_host/printing_message_filter.h" to include
"content/browser/renderer_host/printing_message_filter.h" or is this ok?

[Lei Zhang, 2011/02/22 19:37:42]

This should be fine. Nobody is referring to the file at the old location since
this is a new file.

[jam, 2011/02/22 20:29:41]

actually, the printing code will remain in src\chrome, and not src\content.  The
latter is the minimum required to render a page in a multi-process browser. 
Features like printing, autofill etc are what's provided by the embedder.

[kmadhusu, 2011/02/23 02:27:49]

Done. Moved printing_message_filter from src/content to
src/chrome/browser/printing.

 #include "grit/generated_resources.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_platform_file.h"
 #include "ipc/ipc_switches.h"
 #include "media/base/media_switches.h"
 #include "ui/base/ui_base_switches.h"
 #include "webkit/fileapi/file_system_path_manager.h"
 #include "webkit/plugins/plugin_switches.h"
 
@@ skipping 349 matching lines @@
   channel_->AddFilter(
       new AppCacheDispatcherHost(profile()->GetRequestContext(), id()));
   channel_->AddFilter(new DOMStorageMessageFilter(id(), profile()));
   channel_->AddFilter(new IndexedDBDispatcherHost(id(), profile()));
   channel_->AddFilter(
       GeolocationDispatcherHost::New(
           id(), profile()->GetGeolocationPermissionContext()));
   channel_->AddFilter(new GpuMessageFilter(id()));
   channel_->AddFilter(new PepperFileMessageFilter(id(), profile()));
   channel_->AddFilter(new PepperMessageFilter(profile()));
+  channel_->AddFilter(new PrintingMessageFilter());
   channel_->AddFilter(new speech_input::SpeechInputDispatcherHost(id()));
   channel_->AddFilter(
       new SearchProviderInstallStateMessageFilter(id(), profile()));
   channel_->AddFilter(new FileSystemDispatcherHost(profile()));
   channel_->AddFilter(new device_orientation::MessageFilter());
   channel_->AddFilter(
       new BlobMessageFilter(id(), profile()->GetBlobStorageContext()));
   channel_->AddFilter(new FileUtilitiesMessageFilter(id()));
   channel_->AddFilter(new MimeRegistryMessageFilter());
   channel_->AddFilter(new DatabaseMessageFilter(
@@ skipping 808 matching lines @@
     IPC::PlatformFileForTransit file;
 #if defined(OS_POSIX)
     file = base::FileDescriptor(model_file, false);
 #elif defined(OS_WIN)
     ::DuplicateHandle(::GetCurrentProcess(), model_file, GetHandle(), &file, 0,
                       false, DUPLICATE_SAME_ACCESS);
 #endif
     Send(new ViewMsg_SetPhishingModel(file));
   }
 }