Add missing using statements for JNI types.

android_webview/native/aw_picture.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "android_webview/native/aw_picture.h"
 
 #include "android_webview/native/java_browser_view_renderer_helper.h"
 #include "base/bind.h"
 #include "jni/AwPicture_jni.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
+using base::android::JavaParamRef;
+
 namespace android_webview {
 
 AwPicture::AwPicture(sk_sp<SkPicture> picture)
     : picture_(std::move(picture)) {
   DCHECK(picture_);
 }
 
 AwPicture::~AwPicture() {}
 
 void AwPicture::Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj) {
@@ skipping 21 matching lines @@
     return;
   }
   picture_->playback(canvas_holder->GetCanvas());
 }
 
 bool RegisterAwPicture(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview