Switch Linux Auru ports over to POSIX SHM instead of legacy SYSV SHM.

chrome/renderer/pepper/pepper_pdf_host.cc

 // Copyright (c) 2013 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 "chrome/renderer/pepper/pepper_pdf_host.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/printing/print_web_view_helper.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 300 matching lines @@
       &image_data_desc,
       &image_handle,
       &byte_count);
   ppapi::ScopedPPResource image_data_resource(
       ppapi::ScopedPPResource::PassRef(), host_resource.host_resource());
   if (!success)
     return PP_ERROR_FAILED;
 
   ppapi::host::ReplyMessageContext reply_context =
       context->MakeReplyMessageContext();
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_ANDROID)
+#if defined(TOOLKIT_GTK)
+  // For GTK, we pass the SysV shared memory key in the message.
+  PpapiPluginMsg_PDF_GetResourceImageReply reply_msg(host_resource,
+                                                     image_data_desc,
+                                                     image_handle.fd);
+#elif defined(OS_POSIX) || defined(OS_WIN)
   ppapi::proxy::SerializedHandle serialized_handle;
   PpapiPluginMsg_PDF_GetResourceImageReply reply_msg(host_resource,
                                                      image_data_desc,
                                                      0);
   serialized_handle.set_shmem(image_handle, byte_count);
   reply_context.params.AppendHandle(serialized_handle);
-#elif defined(OS_LINUX)
-  // For Linux, we pass the SysV shared memory key in the message.
-  PpapiPluginMsg_PDF_GetResourceImageReply reply_msg(host_resource,
-                                                     image_data_desc,
-                                                     image_handle.fd);
 #else
   // Not supported on the other platforms.
   // This is a stub reply_msg not to break the build.
   PpapiPluginMsg_PDF_GetResourceImageReply reply_msg(host_resource,
                                                      image_data_desc,
                                                      0);
   NOTIMPLEMENTED();
   return PP_ERROR_NOTSUPPORTED;
 #endif
 
@@ skipping 43 matching lines @@
 
   skia::PlatformCanvas* canvas = image_data->GetPlatformCanvas();
   // Note: Do not skBitmap::copyTo the canvas bitmap directly because it will
   // ignore the allocated pixels in shared memory and re-allocate a new buffer.
   canvas->writePixels(pixels_to_write, 0, 0);
 
   return true;
 }
 
 }  // namespace chrome