Add Java function to retrieve the native library dir.

base/android/java/src/org/chromium/base/PathUtils.java

Index: base/android/java/src/org/chromium/base/PathUtils.java
diff --git a/base/android/java/src/org/chromium/base/PathUtils.java b/base/android/java/src/org/chromium/base/PathUtils.java
index 94403d4df3ae42fdeafaac010ef1be846d8f8423..8ae3bae168f3d232405c96a0140cf11aeab37c6f 100644
--- a/base/android/java/src/org/chromium/base/PathUtils.java
+++ b/base/android/java/src/org/chromium/base/PathUtils.java
@@ -5,6 +5,7 @@
 package org.chromium.base;
 
 import android.content.Context;
+import android.content.pm.ApplicationInfo;
 import android.os.Environment;
 
 import org.chromium.base.CalledByNative;
@@ -41,4 +42,18 @@ class PathUtils {
         return Environment.getExternalStoragePublicDirectory(
                 Environment.DIRECTORY_DOWNLOADS).getPath();
     }
+
+    /**
+     * @return the path to native libraries.
+     */
+    @CalledByNative
+    public static String getNativeLibraryDirectory(Context appContext) {
+        ApplicationInfo ai = appContext.getApplicationInfo();
+        if ((ai.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0 ||
+            (ai.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
+            return ai.nativeLibraryDir;
+        }
+
+        return "/system/lib/";
+    }
 }