Hide fullscreen rotation jank

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 2609171edc35962f998b7e0a8ae23b9c7b1031f8..7b17d2b2b49fc206d9f2ba231e332206b9b50f0a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -2541,6 +2541,13 @@ public class Tab
         TabModelImpl.setActualTabSwitchLatencyMetricRequired();
     }
 
+    /**
+     * Clears the cached thumbnail for this Tab.
+     */
+    public void clearThumbnailPlaceholder() {
+        if (mNativeTabAndroid != 0) nativeClearThumbnailPlaceholder(mNativeTabAndroid);
+    }
+
     /**
      * Push state about whether or not the browser controls can show or hide to the renderer.
      */
@@ -3132,6 +3139,7 @@ public class Tab
             InterceptNavigationDelegate delegate);
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
+    private native void nativeClearThumbnailPlaceholder(long nativeTabAndroid);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
     private native void nativeSetWebappManifestScope(long nativeTabAndroid, String scope);
     private native void nativeEnableEmbeddedMediaExperience(long nativeTabAndroid, boolean enabled);