[build] Fix gn check errors in test/benchmarks/cpp

Expose third_party/google_benchmark:google_benchmark as a public dep
from third_party/google_benchmark:benchmark_main and a v8_libbase
dependency to empty_benchmark to expose base/macros.h.

Bug: v8:7330
Change-Id: I5205af365da2ac7c35647acff90ed65d831cfa07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2851888
Commit-Queue: Dan Elphick <delphick@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74217}

test/benchmarks/cpp/BUILD.gn

@@ -25,6 +25,9 @@ if (v8_enable_google_benchmark) {
 
     sources = [ "empty.cc" ]
 
-    deps = [ "//third_party/google_benchmark:benchmark_main" ]
+    deps = [
+      "//:v8_libbase",
+      "//third_party/google_benchmark:benchmark_main",
+    ]
   }
 }

third_party/google_benchmark/BUILD.gn

@@ -69,6 +69,6 @@ if (v8_enable_google_benchmark) {
   source_set("benchmark_main") {
     testonly = true
     sources = [ "src/src/benchmark_main.cc" ]
-    deps = [ ":google_benchmark" ]
+    public_deps = [ ":google_benchmark" ]
   }
 }