Add ownership edges between HostSharedBitmap and shared memory

base/memory/shared_memory_posix.cc

Index: base/memory/shared_memory_posix.cc
diff --git a/base/memory/shared_memory_posix.cc b/base/memory/shared_memory_posix.cc
index bf29e9f02a1ec5f188ef0f4ff10e12c037835bee..58d6c3146137d805bbef26b213a03e80073ab591 100644
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -395,7 +395,9 @@ bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
   return true;
 }
 
-bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const {
+// static
+bool SharedMemory::GetUniqueId(const SharedMemoryHandle& handle,
+                               SharedMemory::UniqueId* id) {
   // This function is called just after mmap. fstat is a system call that might
   // cause I/O. It's safe to call fstat here because mmap for shared memory is
   // called in two cases:
@@ -406,7 +408,7 @@ bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const {
   // crbug.com/604726#c41.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   struct stat file_stat;
-  if (HANDLE_EINTR(::fstat(static_cast<int>(handle().fd), &file_stat)) != 0)
+  if (HANDLE_EINTR(::fstat(static_cast<int>(handle.fd), &file_stat)) != 0)
     return false;
   id->first = file_stat.st_dev;
   id->second = file_stat.st_ino;