Add support for TraceEvent before the native library is loaded.

base/android/jni_array_unittest.cc

Index: base/android/jni_array_unittest.cc
diff --git a/base/android/jni_array_unittest.cc b/base/android/jni_array_unittest.cc
index 7cb896ce9034fd159e044fdcb8a6f7ee7c2159df..80ec1eac0d2c366664f45147922b5dbac3ff7671 100644
--- a/base/android/jni_array_unittest.cc
+++ b/base/android/jni_array_unittest.cc
@@ -84,6 +84,13 @@ TEST(JniArray, LongConversions) {
 
   const std::vector<int64> vec(kLongs, kLongs + kLen);
   CheckLongConversion(env, kLongs, kLen, ToJavaLongArray(env, vec));
+
+  std::vector<int64_t> longs;
+  ScopedJavaLocalRef<jlongArray> jlongs = ToJavaLongArray(env, vec);
+  AppendJavaLongArrayToLongVector(env, jlongs.obj(), &longs);
+  for (size_t i = 0; i < kLen; ++i) {
+    ASSERT_EQ(vec[i], longs[i]);
+  }
 }
 
 TEST(JniArray, JavaIntArrayToIntVector) {