GN: Add support for prebuilt instrumented libraries.

build/config/sanitizers/BUILD.gn

Index: build/config/sanitizers/BUILD.gn
diff --git a/build/config/sanitizers/BUILD.gn b/build/config/sanitizers/BUILD.gn
index d48ac4e8c07d05503a2317411bca418d930ace55..59821511cc275b515589f75eb13082b064f8dc85 100644
--- a/build/config/sanitizers/BUILD.gn
+++ b/build/config/sanitizers/BUILD.gn
@@ -6,11 +6,12 @@
 # shared_libraries. Unconditionally depend upon this target as it is empty if
 # |is_asan|, |is_lsan|, |is_tsan| and |is_msan| are false.
 group("deps") {
+  deps = [
+    "//third_party/instrumented_libraries:deps",
+  ]
   if (is_asan || is_lsan || is_tsan || is_msan) {
     public_configs = [ ":sanitizer_options_link_helper" ]
-    deps = [
-      ":options_sources",
-    ]
+    deps += [ ":options_sources" ]
   }
 }