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

chrome/common/utility_messages_internal.h

 // Copyright (c) 2009 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.
 
 #include <string>
 #include <vector>
 
 #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"
 
 #define IPC_MESSAGE_START NaClMsgStart
 
 class FilePath;
 class IndexedDBKey;
 class SerializedScriptValue;
 class SkBitmap;
 
@@ skipping 32 matching lines @@
                      int,     // id
                      std::vector<SerializedScriptValue>,
                      string16) // IDBKeyPath
 
 // Tells the utility process that it's running in batch mode.
 IPC_MESSAGE_CONTROL0(UtilityMsg_BatchMode_Started)
 
 // 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 */)
+
 //------------------------------------------------------------------------------
 // Utility process host messages:
 // These are messages from the utility process to the browser.
 // Reply when the utility process is done unpacking an extension.  |manifest|
 // is the parsed manifest.json file.
 // The unpacker should also have written out files containing the decoded
 // images and message catalogs from the extension. See ExtensionUnpacker for
 // details.
 IPC_MESSAGE_CONTROL1(UtilityHostMsg_UnpackExtension_Succeeded,
                      DictionaryValue /* manifest */)
@@ skipping 48 matching lines @@
 // Reply when the utility process has succeeded in obtaining the value for
 // IDBKeyPath.
 IPC_MESSAGE_CONTROL2(UtilityHostMsg_IDBKeysFromValuesAndKeyPath_Succeeded,
                      int /* id */,
                      std::vector<IndexedDBKey> /* value */)
 
 // Reply when the utility process has failed in obtaining the value for
 // 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 */)
+