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

base/android/library_loader/library_loader_hooks.cc

Index: base/android/library_loader/library_loader_hooks.cc
diff --git a/base/android/library_loader/library_loader_hooks.cc b/base/android/library_loader/library_loader_hooks.cc
index 555420a5aa5e65bab2dac58afee9d6a01aa39ceb..0b59a30429676b131f428de41b5b8e6c3889b483 100644
--- a/base/android/library_loader/library_loader_hooks.cc
+++ b/base/android/library_loader/library_loader_hooks.cc
@@ -7,6 +7,7 @@
 #include "base/android/command_line_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/library_loader/library_load_from_apk_status_codes.h"
+#include "base/android/library_loader/library_prefetcher.h"
 #include "base/at_exit.h"
 #include "base/metrics/histogram.h"
 #include "jni/LibraryLoader_jni.h"
@@ -122,6 +123,10 @@ void LibraryLoaderExitHook() {
   }
 }
 
+static jboolean ForkAndPrefetchNativeLibrary(JNIEnv* env, jclass clazz) {
+  return NativeLibraryPrefetcher::ForkAndPrefetchNativeLibrary();
+}
+
 bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }