[Android] Add spellchecking support in android_webview.

android_webview/native/android_webview_jni_registrar.cc

Index: android_webview/native/android_webview_jni_registrar.cc
diff --git a/android_webview/native/android_webview_jni_registrar.cc b/android_webview/native/android_webview_jni_registrar.cc
index c63d915f5d27a7c26e6856a16e016a46edc60e00..b808a1c1026b7c0e5f258cd8d5e71f0de24bf60a 100644
--- a/android_webview/native/android_webview_jni_registrar.cc
+++ b/android_webview/native/android_webview_jni_registrar.cc
@@ -26,6 +26,7 @@
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/trace_event/trace_event.h"
+#include "components/spellcheck/browser/android/component_jni_registrar.h"
 
 namespace android_webview {
 
@@ -50,6 +51,9 @@ static base::android::RegistrationMethod kWebViewRegisteredMethods[] = {
   { "CookieManager", RegisterCookieManager },
   { "AwMessagePortService", RegisterAwMessagePortService },
   { "AwGLFunctor", RegisterAwGLFunctor },
+#if defined(ENABLE_SPELLCHECK)
+  {"SpellCheckerSessionBridge", spellcheck::android::RegisterSpellcheckJni},
+#endif
 };
 
 bool RegisterJni(JNIEnv* env) {