win: Add more memory regions to gathering of PEB

snapshot/win/process_reader_win.cc

Index: snapshot/win/process_reader_win.cc
diff --git a/snapshot/win/process_reader_win.cc b/snapshot/win/process_reader_win.cc
index b8086afda7568c56bfb1307f2125be32ec453fe7..0588a6fb6afa5c44e5c38e41164c0482483c9fd7 100644
--- a/snapshot/win/process_reader_win.cc
+++ b/snapshot/win/process_reader_win.cc
@@ -231,6 +231,20 @@ bool ProcessReaderWin::ReadMemory(WinVMAddress at,
   return true;
 }
 
+WinVMSize ProcessReaderWin::ReadAvailableMemory(WinVMAddress at,
+                                                WinVMSize num_bytes,
+                                                void* into) const {
+  auto ranges = GetAccessibleRangesInMemoryMap(
+      at, num_bytes, process_info_.MemoryInformation());
+  // We only read up until the first unavailable block, so we only read from the
+  // first range.
+  if (ranges.empty())
+    return 0;
+  if (!ReadMemory(ranges.front().base(), ranges.front().size(), into))
+    return 0;
+  return ranges.front().size();
+}
+
 bool ProcessReaderWin::StartTime(timeval* start_time) const {
   FILETIME creation, exit, kernel, user;
   if (!GetProcessTimes(process_, &creation, &exit, &kernel, &user)) {