Prefetch the native library from native code by parsing /proc/pid/maps.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index f1b0bb87358b71be8be7c6238ae87dce09fb8152..48753eb63493ca43e1653506535587e94bc6aeaf 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -108,6 +108,8 @@ component("base") {
     "android/library_loader/library_load_from_apk_status_codes.h",
     "android/library_loader/library_loader_hooks.cc",
     "android/library_loader/library_loader_hooks.h",
+    "android/library_loader/library_prefetcher.cc",
+    "android/library_loader/library_prefetcher.h",
     "android/locale_utils.cc",
     "android/locale_utils.h",
     "android/memory_pressure_listener_android.cc",
@@ -1067,6 +1069,7 @@ test("base_unittests") {
     "android/jni_android_unittest.cc",
     "android/jni_array_unittest.cc",
     "android/jni_string_unittest.cc",
+    "android/library_loader/library_prefetcher_unittest.cc",
     "android/path_utils_unittest.cc",
     "android/scoped_java_ref_unittest.cc",
     "android/sys_utils_unittest.cc",