As the first step in an effort to improve robustness of the cloud print proxy...

chrome/common/utility_messages_internal.h

Index: chrome/common/utility_messages_internal.h
===================================================================
--- chrome/common/utility_messages_internal.h	(revision 69496)
+++ chrome/common/utility_messages_internal.h	(working copy)
@@ -8,6 +8,7 @@
 #include "base/platform_file.h"
 #include "gfx/rect.h"
 #include "ipc/ipc_message_macros.h"
+#include "printing/backend/print_backend.h"
 #include "printing/page_range.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
@@ -60,6 +61,13 @@
 // Tells the utility process that it can shutdown.
 IPC_MESSAGE_CONTROL0(UtilityMsg_BatchMode_Finished)
 
+// Tells the utility process to get capabilities and defaults for the specified
+// printer. Used on Windows to isolate the service process from printer driver
+// crashes by executing this in a separate process. This does not run in a
+// sandbox.
+IPC_MESSAGE_CONTROL1(UtilityMsg_GetPrinterCapsAndDefaults,
+                     std::string)  // printer name

[jam, 2010/12/20 23:10:37]

style nit: *_messages_internal.h files put the parameter name in /* */ comments.
 please be consistent with that style

[sanjeevr, 2010/12/21 21:28:45]

Done.

+
 //------------------------------------------------------------------------------
 // Utility process host messages:
 // These are messages from the utility process to the browser.
@@ -128,3 +136,15 @@
 // IDBKeyPath.
 IPC_MESSAGE_CONTROL1(UtilityHostMsg_IDBKeysFromValuesAndKeyPath_Failed,
                      int /* id */)
+
+// Reply when the utility process has succeeded in obtaining the printer
+// capabilities and defaults.
+IPC_MESSAGE_CONTROL2(UtilityHostMsg_GetPrinterCapsAndDefaults_Succeeded,
+                     std::string,    // printer name
+                     printing::PrinterCapsAndDefaults)
+
+// Reply when the utility process has failed to obtain the printer
+// capabilities and defaults.
+IPC_MESSAGE_CONTROL1(UtilityHostMsg_GetPrinterCapsAndDefaults_Failed,
+                     std::string)    // printer name
+