Add third_party/re2/src to DEPS.

Bug: b/309389865
Change-Id: Idc565340a2f095b243bd8f7c6c1407a111443d0c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/326181
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#41085}
diff --git a/DEPS b/DEPS
index 3c38f89..24be629 100644
--- a/DEPS
+++ b/DEPS
@@ -312,6 +312,10 @@
 
   'src/third_party/openh264/src':
     'https://chromium.googlesource.com/external/github.com/cisco/openh264@09a4f3ec842a8932341b195c5b01e141c8a16eb7',
+
+  'src/third_party/re2/src':
+    'https://chromium.googlesource.com/external/github.com/google/re2.git@24d460a9db6048b9d3e05cfdea13ec9d592545ad',
+
   'src/third_party/r8': {
       'packages': [
           {