Close renderer SharedBitmap file descriptors immediately after mapping

content/child/child_shared_bitmap_manager.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 "content/child/child_shared_bitmap_manager.h"
 
 #include "content/child/child_thread.h"
 #include "content/common/child_process_messages.h"
 #include "ui/gfx/size.h"
 
@@ skipping 37 matching lines @@
 
 ChildSharedBitmapManager::ChildSharedBitmapManager(
     scoped_refptr<ThreadSafeSender> sender)
     : sender_(sender) {
 }
 
 ChildSharedBitmapManager::~ChildSharedBitmapManager() {}
 
 scoped_ptr<cc::SharedBitmap> ChildSharedBitmapManager::AllocateSharedBitmap(
     const gfx::Size& size) {
-  return AllocateSharedMemoryBitmap(size);
+  scoped_ptr<SharedMemoryBitmap> bitmap = AllocateSharedMemoryBitmap(size);
+#if defined(OS_POSIX)
+  // Close file descriptor to avoid running out.
+  if (bitmap)
+    bitmap->shared_memory()->Close();
+#endif
+  return bitmap.Pass();
 }
 
 scoped_ptr<SharedMemoryBitmap>
 ChildSharedBitmapManager::AllocateSharedMemoryBitmap(const gfx::Size& size) {
   TRACE_EVENT2("renderer",
                "ChildSharedBitmapManager::AllocateSharedMemoryBitmap", "width",
                size.width(), "height", size.height());
   size_t memory_size;
   if (!cc::SharedBitmap::SizeInBytes(size, &memory_size))
     return scoped_ptr<SharedMemoryBitmap>();
@@ skipping 33 matching lines @@
   if (!mem->ShareToProcess(base::GetCurrentProcessHandle(), &handle_to_send))
     return scoped_ptr<cc::SharedBitmap>();
 #endif
   sender_->Send(new ChildProcessHostMsg_AllocatedSharedBitmap(
       mem->mapped_size(), handle_to_send, id));
 
   return make_scoped_ptr(new ChildSharedBitmap(sender_, mem, id));
 }
 
 }  // namespace content