win: support x64 reading x86 (wow64)

snapshot/win/crashpad_snapshot_test_crashing_child.cc

Index: snapshot/win/crashpad_snapshot_test_crashing_child.cc
diff --git a/snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc b/snapshot/win/crashpad_snapshot_test_crashing_child.cc
similarity index 52%
copy from snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc
copy to snapshot/win/crashpad_snapshot_test_crashing_child.cc
index b8953207b4a0d6034622dd753dcb8d97e22a58d6..2654ae2a488e173a8e7d7439f5c21f96743f5c74 100644
--- a/snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc
+++ b/snapshot/win/crashpad_snapshot_test_crashing_child.cc
@@ -12,8 +12,31 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <stdint.h>
 #include <stdlib.h>
+#include <windows.h>
+
+#include "base/logging.h"
+#include "client/crashpad_client.h"
+#include "util/file/file_io.h"
+
+__declspec(noinline) uint64_t CurrentAddress() {
+  return reinterpret_cast<uint64_t>(_ReturnAddress());
+}
 
 int main(int argc, char* argv[]) {
-  return EXIT_SUCCESS;
+  CHECK_EQ(argc, 2);
+
+  crashpad::CrashpadClient client;
+  CHECK(client.SetHandler(argv[1]));
+  CHECK(client.UseHandler());
+
+  HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
+  CHECK_NE(out, INVALID_HANDLE_VALUE);
+  uint64_t break_address = CurrentAddress();
+  crashpad::CheckedWriteFile(out, &break_address, sizeof(break_address));
+
+  __debugbreak();
+
+  return 0;
 }