gn2bp: Add compile_multilib attribute

Test: ./update_results.sh
Change-Id: I78926bf7475fb2d491ed1e18fc4327387c86ce83
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 233e6f8..f9ea631 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -314,6 +314,7 @@
     self.rtti = False
     # Name of the output. Used for setting .so file name for libcronet
     self.stem = None
+    self.compile_multilib = None
 
   def to_string(self, output):
     if self.comment:
@@ -361,6 +362,7 @@
     self._output_field(output, 'linker_scripts')
     self._output_field(output, 'cppflags')
     self._output_field(output, 'stem')
+    self._output_field(output, 'compile_multilib')
     if self.rtti:
       self._output_field(output, 'rtti')