customtabs: Update the benchmark app for hidden tab benchmarking.

tools/android/customtabs_benchmark/BUILD.gn

Index: tools/android/customtabs_benchmark/BUILD.gn
diff --git a/tools/android/customtabs_benchmark/BUILD.gn b/tools/android/customtabs_benchmark/BUILD.gn
index 01c5ccfc3a2c85ecf11551a185bf923d22505969..db5962a435358288a79e7aae6177d3c7d0417fa0 100644
--- a/tools/android/customtabs_benchmark/BUILD.gn
+++ b/tools/android/customtabs_benchmark/BUILD.gn
@@ -18,6 +18,7 @@ android_apk("customtabs_benchmark_apk") {
   apk_name = "CustomTabsBenchmark"
   deps = [
     ":customtabs_benchmark_apk_resources",
+    "//third_party/android_tools:android_support_v4_java",
     "//third_party/custom_tabs_client:custom_tabs_support_java",
   ]
 }