[libfuzzer] Adding and registering ASan Debug build.

scripts/slave/recipes/chromium_libfuzzer.py

Index: scripts/slave/recipes/chromium_libfuzzer.py
diff --git a/scripts/slave/recipes/chromium_libfuzzer.py b/scripts/slave/recipes/chromium_libfuzzer.py
index 5a1119505af234c9e89dee596e2fe59a17b54e5b..a6fd34a21a602037f217d716b1d8669029b48e93 100644
--- a/scripts/slave/recipes/chromium_libfuzzer.py
+++ b/scripts/slave/recipes/chromium_libfuzzer.py
@@ -33,6 +33,17 @@ BUILDERS = freeze({
         'upload_bucket': 'chromium-browser-libfuzzer',
         'upload_directory': 'asan',
       },
+      'Libfuzzer Upload Linux ASan Debug': {
+        'chromium_config': 'chromium_clang',
+        'chromium_apply_config': [ 'proprietary_codecs' ],
+        'chromium_config_kwargs': {
+          'BUILD_CONFIG': 'Debug',
+          'TARGET_PLATFORM': 'linux',
+          'TARGET_BITS': 64,
+        },
+        'upload_bucket': 'chromium-browser-libfuzzer',
+        'upload_directory': 'asan',
+      },
       'Libfuzzer Upload Linux MSan': {
         'chromium_config': 'chromium_clang',
         'chromium_apply_config': ['msan', 'msan_full_origin_tracking',
@@ -106,8 +117,14 @@ def RunSteps(api):
   api.step.active_result.presentation.logs['targets'] = targets
   api.chromium.compile(targets=targets)
 
+  # Use 'Release' as default value since it has been hardcoded previously.
+  build_config = 'Release'
+  config_kwargs = bot_config.get('chromium_config_kwargs')
+  if config_kwargs and config_kwargs.get('BUILD_CONFIG'):
+    build_config = config_kwargs.get('BUILD_CONFIG')
+
   api.archive.clusterfuzz_archive(
-          build_dir=api.path['slave_build'].join('src', 'out', 'Release'),
+          build_dir=api.path['slave_build'].join('src', 'out', build_config),
           update_properties=checkout_results.json.output['properties'],
           gs_bucket=bot_config['upload_bucket'],
           archive_prefix='libfuzzer',