linux: add windowless plugin plumbing

chrome/common/transport_dib_linux.cc

 // 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 <errno.h>
 #include <stdlib.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 
 #include "base/gfx/size.h"
@@ skipping 51 matching lines @@
   dib->address_ = address;
   dib->size_ = size;
   return dib;
 }
 
 TransportDIB* TransportDIB::Map(Handle shmkey) {
   struct shmid_ds shmst;
   if (shmctl(shmkey, IPC_STAT, &shmst) == -1)
     return NULL;
 
-  void* address = shmat(shmkey, NULL /* desired address */, SHM_RDONLY);
+  void* address = shmat(shmkey, NULL /* desired address */, 0 /* flags */);
   if (address == kInvalidAddress)
     return NULL;
 
   TransportDIB* dib = new TransportDIB;
 
   dib->address_ = address;
   dib->size_ = shmst.shm_segsz;
   dib->key_ = shmkey;
   return dib;
 }
@@ skipping 17 matching lines @@
 }
 
 XID TransportDIB::MapToX(Display* display) {
   if (!x_shm_) {
     x_shm_ = x11_util::AttachSharedMemory(display, key_);
     display_ = display;
   }
 
   return x_shm_;
 }