win: Save contents of TEBs allowing !teb and !gle to work in windbg

snapshot/thread_snapshot.h

Index: snapshot/thread_snapshot.h
diff --git a/snapshot/thread_snapshot.h b/snapshot/thread_snapshot.h
index d43fc6e5c8ef787e115e5aab8439654d07f9dedb..4d732578e54eb17a43018336073c6741ffd68d39 100644
--- a/snapshot/thread_snapshot.h
+++ b/snapshot/thread_snapshot.h
@@ -17,6 +17,8 @@
 
 #include <stdint.h>
 
+#include <vector>
+
 namespace crashpad {
 
 struct CPUContext;
@@ -62,6 +64,15 @@ class ThreadSnapshot {
   //! \brief Returns the base address of a region used to store thread-specific
   //!     data.
   virtual uint64_t ThreadSpecificDataAddress() const = 0;
+
+  //! \brief Returns a vector of additional memory blocks that should be
+  //!     included in a minidump.
+  //!
+  //! \return A vector of MemorySnapshot objects that will be included in the
+  //!     crash dump. The caller does not take ownership of these objects, they
+  //!     are scoped to the lifetime of the ThreadSnapshot object that they
+  //!     were obtained from.
+  virtual std::vector<const MemorySnapshot*> ExtraMemory() const = 0;
 };
 
 }  // namespace crashpad