Selectively perform JNI registration in render processes on Android.

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

Index: base/android/java/src/org/chromium/base/JNIUtils.java
diff --git a/base/android/java/src/org/chromium/base/JNIUtils.java b/base/android/java/src/org/chromium/base/JNIUtils.java
index f971b5e03cebd984bcd14066947c40a475f2afe4..3fcec91316a9da55eb53289d77f1fafb194c692d 100644
--- a/base/android/java/src/org/chromium/base/JNIUtils.java
+++ b/base/android/java/src/org/chromium/base/JNIUtils.java
@@ -12,6 +12,8 @@ import org.chromium.base.annotations.MainDex;
  */
 @MainDex
 public class JNIUtils {
+    private static Boolean sSelectiveJniRegistrationEnabled;
+
     /**
      * This returns a ClassLoader that is capable of loading Chromium Java code. Such a ClassLoader
      * is needed for the few cases where the JNI mechanism is unable to automatically determine the
@@ -21,4 +23,24 @@ public class JNIUtils {
     public static Object getClassLoader() {
         return JNIUtils.class.getClassLoader();
     }
+
+    /**
+     * @return whether or not the current process supports selective JNI registration.
+     */
+    @CalledByNative
+    public static boolean isSelectiveJniRegistrationEnabled() {
+        if (sSelectiveJniRegistrationEnabled == null) {
+            sSelectiveJniRegistrationEnabled = false;
+        }
+        return sSelectiveJniRegistrationEnabled;
+    }
+
+    /**
+     * Allow this process to selectively perform JNI registration. This must be called before
+     * loading native libraries or it will have no effect.
+     */
+    public static void enableSelectiveJniRegistration() {
+        assert sSelectiveJniRegistrationEnabled == null;
+        sSelectiveJniRegistrationEnabled = true;
+    }
 }