Created a new BrowserMessageFilter to handle print related IPC messages.

chrome/browser/renderer_host/browser_render_process_host.cc

Index: chrome/browser/renderer_host/browser_render_process_host.cc
diff --git a/chrome/browser/renderer_host/browser_render_process_host.cc b/chrome/browser/renderer_host/browser_render_process_host.cc
index f776ac13ccf00c78d695dbfad9b010d5c844b773..738fc65607adf6e4d1be7dbd68fe7abd378f8f4d 100644
--- a/chrome/browser/renderer_host/browser_render_process_host.cc
+++ b/chrome/browser/renderer_host/browser_render_process_host.cc
@@ -48,6 +48,7 @@
 #include "chrome/browser/mime_registry_message_filter.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/plugin_service.h"
+#include "chrome/browser/printing/printing_message_filter.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_host/audio_renderer_host.h"
 #include "chrome/browser/renderer_host/blob_message_filter.h"
@@ -458,6 +459,7 @@ void BrowserRenderProcessHost::CreateMessageFilters() {
   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()));