content: Add DeletedDiscardableSharedMemory IPC.

content/child/child_discardable_shared_memory_manager.h

Index: content/child/child_discardable_shared_memory_manager.h
diff --git a/content/child/child_discardable_shared_memory_manager.h b/content/child/child_discardable_shared_memory_manager.h
index 27c8b83c9feea3074b5ee07652007b2c43c2b3df..cc534e4301fb226989bf6ffa48b4570096ee88cb 100644
--- a/content/child/child_discardable_shared_memory_manager.h
+++ b/content/child/child_discardable_shared_memory_manager.h
@@ -11,6 +11,7 @@
 #include "content/child/thread_safe_sender.h"
 #include "content/common/content_export.h"
 #include "content/common/discardable_shared_memory_heap.h"
+#include "content/common/host_discardable_shared_memory_manager.h"
 
 namespace content {
 
@@ -35,7 +36,8 @@ class CONTENT_EXPORT ChildDiscardableSharedMemoryManager
 
  private:
   scoped_ptr<base::DiscardableSharedMemory>
-  AllocateLockedDiscardableSharedMemory(size_t size);
+  AllocateLockedDiscardableSharedMemory(size_t size,
+                                        DiscardableSharedMemoryId id);
   void MemoryUsageChanged(size_t new_bytes_allocated,
                           size_t new_bytes_free) const;