Introducing LiteRT in Chromium third_party.

Design doc: https://docs.google.com/document/d/1ho9HJ1sVmxBqFP1MDYgVM79f4tY_VpKEPct2AJlyFK4

Approval granted from Chrome ATL: https://groups.google.com/a/google.com/g/chrome-atls-discuss/c/CrsBBTGpM-U/m/q82S1AGZCAAJ

BYPASS_LARGE_CHANGE_WARNING: Initial build file added.

Bug: 454732289
Change-Id: Ibd37b747a945321c0e412164c63971e5b5dfdbc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7132222
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Commit-Queue: Lynne Jiang <lyjiang@google.com>
Cr-Commit-Position: refs/heads/main@{#1556492}
NOKEYCHECK=True
GitOrigin-RevId: 52fa5c08109b4c8c16cfe8f1f98e3ad5c236ad95

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index 8ec1c9b..91e745b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -72,6 +72,7 @@
     "//third_party/abseil-cpp/absl/container:node_hash_map",
     "//third_party/abseil-cpp/absl/container:node_hash_set",
     "//third_party/abseil-cpp/absl/debugging:failure_signal_handler",
+    "//third_party/abseil-cpp/absl/debugging:leak_check",
     "//third_party/abseil-cpp/absl/debugging:stacktrace",
     "//third_party/abseil-cpp/absl/debugging:symbolize",
     "//third_party/abseil-cpp/absl/functional:any_invocable",