Remove DrawGLFunctor CleanupReference.

android_webview/glue/java/src/com/android/webview/chromium/DrawGLFunctor.java

 // Copyright 2014 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.
 
 package com.android.webview.chromium;
 
 import android.graphics.Canvas;
 import android.os.Build;
 import android.view.View;
 
 import com.android.webview.chromium.WebViewDelegateFactory.WebViewDelegate;
 
 import org.chromium.android_webview.AwContents;
-import org.chromium.content.common.CleanupReference;
 
 /**
  * Simple Java abstraction and wrapper for the native DrawGLFunctor flow.
  * An instance of this class can be constructed, bound to a single view context (i.e. AwContennts)
  * and then drawn and detached from the view tree any number of times (using requestDrawGL and
  * detach respectively).
  */
 class DrawGLFunctor implements AwContents.NativeDrawGLFunctor {
     private static final String TAG = DrawGLFunctor.class.getSimpleName();
 
     // Pointer to native side instance
-    private final CleanupReference mCleanupReference;
     private final DestroyRunnable mDestroyRunnable;
     private final WebViewDelegate mWebViewDelegate;
 
     public DrawGLFunctor(long viewContext, WebViewDelegate webViewDelegate) {
         mDestroyRunnable = new DestroyRunnable(nativeCreateGLFunctor(viewContext));
-        mCleanupReference = new CleanupReference(this, mDestroyRunnable);
         mWebViewDelegate = webViewDelegate;
     }
 
     @Override
     public void detach(View containerView) {
+        if (mDestroyRunnable.mNativeDrawGLFunctor == 0) {
+            throw new RuntimeException("detach on already destroyed DrawGLFunctor");
+        }
         mWebViewDelegate.detachDrawGlFunctor(containerView, mDestroyRunnable.mNativeDrawGLFunctor);
     }
 
     private static final boolean sSupportFunctorReleasedCallback =
             (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) || "N".equals(Build.VERSION.CODENAME);
 
     @Override
     public boolean requestDrawGL(Canvas canvas, Runnable releasedCallback) {
+        if (mDestroyRunnable.mNativeDrawGLFunctor == 0) {
+            throw new RuntimeException("requestDrawGL on already destroyed DrawGLFunctor");
+        }
         assert canvas != null;
         if (sSupportFunctorReleasedCallback) {
             assert releasedCallback != null;
             mWebViewDelegate.callDrawGlFunction(
                     canvas, mDestroyRunnable.mNativeDrawGLFunctor, releasedCallback);
         } else {
             assert releasedCallback == null;
             mWebViewDelegate.callDrawGlFunction(canvas, mDestroyRunnable.mNativeDrawGLFunctor);
         }
         return true;
     }
 
     @Override
     public boolean requestInvokeGL(View containerView, boolean waitForCompletion) {
+        if (mDestroyRunnable.mNativeDrawGLFunctor == 0) {
+            throw new RuntimeException("requestInvokeGL on already destroyed DrawGLFunctor");
+        }
         if (!sSupportFunctorReleasedCallback
                 && !mWebViewDelegate.canInvokeDrawGlFunctor(containerView)) {
             return false;
         }
 
         mWebViewDelegate.invokeDrawGlFunctor(
                 containerView, mDestroyRunnable.mNativeDrawGLFunctor, waitForCompletion);
         return true;
     }
 
     @Override
     public boolean supportsDrawGLFunctorReleasedCallback() {
         return sSupportFunctorReleasedCallback;
     }
 
+    @Override
+    public Runnable getDestroyRunnable() {
+        return mDestroyRunnable;
+    }
+
     public static void setChromiumAwDrawGLFunction(long functionPointer) {
         nativeSetChromiumAwDrawGLFunction(functionPointer);
     }
 
     // Holds the core resources of the class, everything required to correctly cleanup.
     // IMPORTANT: this class must not hold any reference back to the outer DrawGLFunctor
     // instance, as that will defeat GC of that object.
     private static final class DestroyRunnable implements Runnable {
         private long mNativeDrawGLFunctor;
         DestroyRunnable(long nativeDrawGLFunctor) {
             mNativeDrawGLFunctor = nativeDrawGLFunctor;
             assert mNativeDrawGLFunctor != 0;
         }
 
         // Called when the outer DrawGLFunctor instance has been GC'ed, i.e this is its finalizer.
         @Override
         public void run() {
             assert mNativeDrawGLFunctor != 0;
             nativeDestroyGLFunctor(mNativeDrawGLFunctor);
             mNativeDrawGLFunctor = 0;
         }
     }
 
     private static native long nativeCreateGLFunctor(long viewContext);
     private static native void nativeDestroyGLFunctor(long functor);
     private static native void nativeSetChromiumAwDrawGLFunction(long functionPointer);
 }