Implement SharedMemory::NewAnonymousReadOnly(contents).

base/memory/shared_memory_win.cc

Index: base/memory/shared_memory_win.cc
diff --git a/base/memory/shared_memory_win.cc b/base/memory/shared_memory_win.cc
index 42e0b046b96e5818d3cfe05546e32a8857a91012..8807368570da4c95d565d8baa0719bade968df9e 100644
--- a/base/memory/shared_memory_win.cc
+++ b/base/memory/shared_memory_win.cc
@@ -94,6 +94,18 @@ size_t SharedMemory::GetHandleLimit() {
   return static_cast<size_t>(1 << 23);
 }
 
+// static
+scoped_ptr<SharedMemory> SharedMemory::NewAnonymousReadOnly(
+    StringPiece contents) {
+  SharedMemory writable_handle;
+  writable_handle.CreateAndMapAnonymous(contents.size());
+  memcpy(writable_handle.memory(), contents.data(), contents.size());
+  writable_handle.Unmap();
+
+  return make_scoped_ptr(new SharedMemory(
+      writable_handle.handle(), /*read_only=*/true, GetCurrentProcess()));
+}
+
 bool SharedMemory::CreateAndMapAnonymous(size_t size) {
   return CreateAnonymous(size) && Map(size);
 }