Linux: print page to file rather than using shared memory to send it to the b...

chrome/common/render_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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 1378 matching lines @@
 
 #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(ViewHostMsg_DuplicateSection,
                              base::SharedMemoryHandle /* renderer handle */,
                              base::SharedMemoryHandle /* browser handle */)
 #endif
 
 #if defined(OS_LINUX)
-  // Asks the browser create a block of shared memory for the renderer to fill
+  // Asks the browser create a temporary file for the renderer to fill
   // in resulting NativeMetafile in printing.
-  IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_AllocateShareMemory,
-                             size_t /* buffer size */,
-                             base::SharedMemoryHandle /* browser handle */)
+  IPC_SYNC_MESSAGE_CONTROL0_2(ViewHostMsg_AllocateTempFileForPrinting,
+                              base::FileDescriptor /* temp file fd */,
+                              int /* fd in browser*/)
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_TempFileForPrintingWritten,
+                       int /* fd in browser */)
 #endif
 
   // Provide the browser process with information about the WebCore resource
   // cache.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_ResourceTypeStats,
                        WebKit::WebCache::ResourceTypeStats)
 
   // Notify the browser that this render process can or can't be suddenly
   // terminated.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_SuddenTerminationChanged,
@@ skipping 319 matching lines @@
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileAttributes,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
   // Asks the browser process to return the size of a DB file
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileSize,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
 IPC_END_MESSAGES(ViewHost)