Hide fullscreen rotation jank

content/browser/web_contents/web_contents_android.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 "content/browser/web_contents/web_contents_android.h"
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
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 }
 
 jint WebContentsAndroid::GetBackgroundColor(JNIEnv* env,
                                             const JavaParamRef<jobject>& obj) {
   RenderWidgetHostViewAndroid* rwhva = GetRenderWidgetHostViewAndroid();
   if (!rwhva)
     return SK_ColorWHITE;
   return rwhva->GetCachedBackgroundColor();
 }
 
+jboolean WebContentsAndroid::CanShowThumbnailPlaceholder(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  RenderWidgetHostViewAndroid* rwhva = GetRenderWidgetHostViewAndroid();
+  if (!rwhva)
+    return true;
+  return rwhva->CanShowThumbnailPlaceholder();
+}
+
 ScopedJavaLocalRef<jstring> WebContentsAndroid::GetURL(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) const {
   return ConvertUTF8ToJavaString(env, web_contents_->GetURL().spec());
 }
 
 ScopedJavaLocalRef<jstring> WebContentsAndroid::GetLastCommittedURL(
     JNIEnv* env,
     const JavaParamRef<jobject>&) const {
   return ConvertUTF8ToJavaString(env,
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       env, obj, callback, id, http_status_code, jurl, jbitmaps, jsizes);
 }
 
 void WebContentsAndroid::SetMediaSession(
     const ScopedJavaLocalRef<jobject>& j_media_session) {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_WebContentsImpl_setMediaSession(env, obj_, j_media_session);
 }
 
 }  // namespace content