Adding Abseil LICENSE to LIB_TO_LICENSES_DICT.

Bug: webrtc:8821
Change-Id: I5e9f8b58907d74d9be5e4c82a82412b8e665e7bf
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/69805
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22891}
diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index 884628b..9bbe752 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -22,6 +22,7 @@
 
 
 LIB_TO_LICENSES_DICT = {
+    'abseil-cpp': ['third_party/abseil-cpp/LICENSE'],
     'android_tools': ['third_party/android_tools/LICENSE'],
     'auto': ['third_party/auto/src/LICENSE.txt'],
     'bazel': ['third_party/bazel/LICENSE'],