Selectively perform JNI registration in render processes on Android.

base/android/jni_generator/jni_generator_helper.h

Index: base/android/jni_generator/jni_generator_helper.h
diff --git a/base/android/jni_generator/jni_generator_helper.h b/base/android/jni_generator/jni_generator_helper.h
index 4c159c03a9f3975b08b487821a1839185918017b..b4bc6709fb217b94ecf0bb1675a1d2abc08ec618 100644
--- a/base/android/jni_generator/jni_generator_helper.h
+++ b/base/android/jni_generator/jni_generator_helper.h
@@ -42,6 +42,22 @@ inline void CheckException(JNIEnv* env) {
   base::android::CheckException(env);
 }
 
+inline bool ShouldSkipJniRegistration(bool is_maindex_class) {
+  base::android::JniRegistrationType jni_type =
+      base::android::FetchJniRegistrationType();
+  if (jni_type == base::android::NO_JNI_REGISTRATION) {
+    // TODO(estevenson): Change this to a DCHECK.
+    return true;
+  } else if (jni_type == base::android::ALL_JNI_REGISTRATION) {
+    return false;
+  } else if (jni_type == base::android::SELECTIVE_JNI_REGISTRATION) {
+    return !is_maindex_class;
+  } else {
+    NOTREACHED() << "g_jni_registration_type not set.";
+    return false;
+  }
+}
+
 }  // namespace jni_generator
 
 #endif  // BASE_ANDROID_JNI_GENERATOR_JNI_GENERATOR_HELPER_H_