Pass printing result to the browser....

chrome/browser/renderer_host/resource_message_filter.cc

Index: chrome/browser/renderer_host/resource_message_filter.cc
===================================================================
--- chrome/browser/renderer_host/resource_message_filter.cc	(revision 25608)
+++ chrome/browser/renderer_host/resource_message_filter.cc	(working copy)
@@ -323,7 +323,13 @@
                           OnGetPreferredExtensionForMimeType)
       IPC_MESSAGE_HANDLER(ViewHostMsg_GetCPBrowsingContext,
                           OnGetCPBrowsingContext)
+#if defined(OS_WIN)
       IPC_MESSAGE_HANDLER(ViewHostMsg_DuplicateSection, OnDuplicateSection)
+#endif
+#if defined(OS_LINUX)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_AllocateShareMemory,
+                          OnAllocateShareMemory)
+#endif
       IPC_MESSAGE_HANDLER(ViewHostMsg_ResourceTypeStats, OnResourceTypeStats)
       IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_ResolveProxy, OnResolveProxy)
       IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_GetDefaultPrintSettings,
@@ -675,6 +681,7 @@
       CPBrowsingContextManager::Instance()->Allocate(request_context_.get());
 }
 
+#if defined(OS_WIN)
 void ResourceMessageFilter::OnDuplicateSection(
     base::SharedMemoryHandle renderer_handle,
     base::SharedMemoryHandle* browser_handle) {
@@ -683,7 +690,31 @@
   base::SharedMemory shared_buf(renderer_handle, true, handle());
   shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), browser_handle);
 }
+#endif
 
+#if defined(OS_LINUX)
+void ResourceMessageFilter::OnAllocateShareMemory(
+    size_t buffer_size,
+    base::SharedMemoryHandle* browser_handle) {
+  // We don't want to allocate a super big chunk of memory.
+  // 32MB should be large enough for printing on Linux.
+  if (buffer_size > 32 * 1024 * 1024) {
+    *browser_handle = base::SharedMemory::NULLHandle();
+    NOTREACHED() << "Buffer too large: " << buffer_size;
+    return;
+  }
+  base::SharedMemory shared_buf;
+  shared_buf.Create(L"", false, false, buffer_size);
+  if (shared_buf.Map(buffer_size)) {
+    shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), browser_handle);
+  } else {
+    *browser_handle = base::SharedMemory::NULLHandle();
+    NOTREACHED() << "Cannot map buffer";
+    return;
+  }
+}
+#endif
+
 void ResourceMessageFilter::OnResourceTypeStats(
     const WebCache::ResourceTypeStats& stats) {
   HISTOGRAM_COUNTS("WebCoreCache.ImagesSizeKB",