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

base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java

Index: base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
diff --git a/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java b/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
index 484c6bc56d55596cdf77610e3cbf8e541c4d3d67..ed204cecebe05fc80dd6945e7ac1a369e0308c2f 100644
--- a/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
+++ b/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
@@ -573,4 +573,10 @@ public class LibraryLoader {
     // Get the version of the native library. This is needed so that we can check we
     // have the right version before initializing the (rest of the) JNI.
     private native String nativeGetVersionNumber();
+
+    // Finds the ranges corresponding to the native library pages and then forks
+    // a new process to prefetch these pages. The new process then
+    // terminates. Note that getting the ranges involves file operations in
+    // /proc/ and is done in the calling thread of the original process.
+    public static native void nativeForkAndPrefetchNativeLibrary();
 }