win: Implement CRASHPAD_SIMULATE_CRASH()

snapshot/win/exception_snapshot_win.cc

Index: snapshot/win/exception_snapshot_win.cc
diff --git a/snapshot/win/exception_snapshot_win.cc b/snapshot/win/exception_snapshot_win.cc
index 731669ad49cd41c58a5d26ae2abdb1cfb6c9b252..8dc5e460e1c0b55bffae19a93fa3a4c0d09f676c 100644
--- a/snapshot/win/exception_snapshot_win.cc
+++ b/snapshot/win/exception_snapshot_win.cc
@@ -134,11 +134,20 @@ bool ExceptionSnapshotWin::InitializeFromExceptionPointers(
     LOG(ERROR) << "EXCEPTION_POINTERS read failed";
     return false;
   }
-  if (!exception_pointers.ExceptionRecord) {
-    LOG(ERROR) << "null ExceptionRecord";
+
+  if (!process_reader.ReadMemory(
+          static_cast<WinVMAddress>(exception_pointers.ContextRecord),
+          sizeof(*context_record),
+          context_record)) {
+    LOG(ERROR) << "ContextRecord";
     return false;
   }
 
+  if (!exception_pointers.ExceptionRecord) {
+    // ExceptionRecord can be null when we're doing a DumpWithoutCrash().
+    return true;
+  }
+
   ExceptionRecordType first_record;
   if (!process_reader.ReadMemory(
           static_cast<WinVMAddress>(exception_pointers.ExceptionRecord),
@@ -157,14 +166,6 @@ bool ExceptionSnapshotWin::InitializeFromExceptionPointers(
     LOG(WARNING) << "dropping chained ExceptionRecord";
   }
 
-  if (!process_reader.ReadMemory(
-          static_cast<WinVMAddress>(exception_pointers.ContextRecord),
-          sizeof(*context_record),
-          context_record)) {
-    LOG(ERROR) << "ContextRecord";
-    return false;
-  }
-
   return true;
 }