Implement new method to get process base address in Windows sandbox.

sandbox/win/src/sandbox_types.h

Index: sandbox/win/src/sandbox_types.h
diff --git a/sandbox/win/src/sandbox_types.h b/sandbox/win/src/sandbox_types.h
index 65d0c8e73a6aa8b5ea3cc8ac17e056d5de66793b..ae36ef5c95f9c294dd8664c01c6de919321bee1d 100644
--- a/sandbox/win/src/sandbox_types.h
+++ b/sandbox/win/src/sandbox_types.h
@@ -104,6 +104,8 @@ enum ResultCode : int {
   SBOX_ERROR_CANNOT_RESOLVE_INTERCEPTION_THUNK = 41,
   // Cannot write interception thunk to child process.
   SBOX_ERROR_CANNOT_WRITE_INTERCEPTION_THUNK = 42,
+  // Cannot find the base address of the new process.
+  SBOX_ERROR_CANNOT_FIND_BASE_ADDRESS = 43,
   // Placeholder for last item of the enum.
   SBOX_ERROR_LAST
 };