PrintPreview: While printing the preview data, set the initiator tab title as print job name.

chrome/common/print_messages.h

 // 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.
 
 // IPC messages for printing.
 // Multiply-included message file, hence no include guard.
 
 #include "base/values.h"
 #include "base/shared_memory.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 142 matching lines @@
 // Messages sent from the renderer to the browser.
 
 #if defined(OS_WIN)
 // Duplicates a shared memory handle from the renderer to the browser. Then
 // the renderer can flush the handle.
 IPC_SYNC_MESSAGE_ROUTED1_1(PrintHostMsg_DuplicateSection,
                            base::SharedMemoryHandle /* renderer handle */,
                            base::SharedMemoryHandle /* browser handle */)
 #endif
 
-// Tells the browser that the renderer is done calculating the number of
-// rendered pages according to the specified settings.
-IPC_MESSAGE_ROUTED2(PrintHostMsg_DidGetPrintedPagesCount,
+// Tells the browser that the renderer is done identifying the basic print job
+// information such as job title and total number of rendered pages according
+// to the specified settings.
+IPC_MESSAGE_ROUTED3(PrintHostMsg_DidGetBasicPrintJobInfo,
                     int /* rendered document cookie */,
-                    int /* number of rendered pages */)
+                    int /* number of rendered pages */,
+                    string16 /* job_title */)
 
 // Sends back to the browser the rendered "printed page" that was requested by
 // a ViewMsg_PrintPage message or from scripted printing. The memory handle in
 // this message is already valid in the browser process.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidPrintPage,
                     PrintHostMsg_DidPrintPage_Params /* page content */)
 
 // The renderer wants to know the default print settings.
 IPC_SYNC_MESSAGE_ROUTED0_1(PrintHostMsg_GetDefaultPrintSettings,
                            PrintMsg_Print_Params /* default_settings */)
@@ skipping 28 matching lines @@
 IPC_MESSAGE_ROUTED0(PrintHostMsg_PrintPreviewNodeUnderContextMenu)
 
 // Asks the browser to do print preview for window.print().
 IPC_MESSAGE_ROUTED0(PrintHostMsg_ScriptInitiatedPrintPreview)
 
 // Sends back to the browser the rendered "printed document" for preview that
 // was requested by a PrintMsg_PrintPreview message. The memory handle in this
 // message is already valid in the browser process.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PagesReadyForPreview,
                     PrintHostMsg_DidPreviewDocument_Params /* params */)