Avoid crash if onDetachedFromWindow called after destroy

This also removes the temporary logging from commit
f8dafa1.

bug:6535911
Change-Id: Icf1d0438b349a0e92e7d9cefed57a252eed2b9b0

Author: ChrisCraik

core/java/android/webkit/WebViewClassic.java

@@ -2069,11 +2069,20 @@ public void destroy() {
     }
 
     private void destroyImpl() {
-        int drawGLFunction = nativeGetDrawGLFunction(mNativeClass);
         ViewRootImpl viewRoot = mWebView.getViewRootImpl();
-        Log.d(LOGTAG, String.format("destroyImpl, functor %x, viewroot == null %b, isHWAccel %b",
-                                    drawGLFunction, (viewRoot == null),
-                                    mWebView.isHardwareAccelerated()));
+        if (viewRoot != null) {
+            Log.e(LOGTAG, "Error: WebView.destroy() called while still attached!");
+        }
+
+        if (mWebView.isHardwareAccelerated()) {
+            int drawGLFunction = nativeGetDrawGLFunction(mNativeClass);
+            if (drawGLFunction != 0 && viewRoot != null) {
+                // functor should have been detached in onDetachedFromWindow, do
+                // additionally here for safety
+                viewRoot.detachFunctor(drawGLFunction);
+            }
+        }
+
         mCallbackProxy.blockMessages();
         clearHelpers();
         if (mListBoxDialog != null) {
@@ -5301,12 +5310,9 @@ public void onDetachedFromWindow() {
 
         updateHwAccelerated();
 
-        int drawGLFunction = nativeGetDrawGLFunction(mNativeClass);
-        ViewRootImpl viewRoot = mWebView.getViewRootImpl();
-        Log.d(LOGTAG, String.format("destroyImpl, functor %x, viewroot == null %b, isHWAccel %b",
-                                    drawGLFunction, (viewRoot == null),
-                                    mWebView.isHardwareAccelerated()));
         if (mWebView.isHardwareAccelerated()) {
+            int drawGLFunction = nativeGetDrawGLFunction(mNativeClass);
+            ViewRootImpl viewRoot = mWebView.getViewRootImpl();
             if (drawGLFunction != 0 && viewRoot != null) {
                 viewRoot.detachFunctor(drawGLFunction);
             }

libs/hwui/OpenGLRenderer.cpp

@@ -250,7 +250,6 @@ void OpenGLRenderer::resume() {
 }
 
 void OpenGLRenderer::detachFunctor(Functor* functor) {
-    ALOGD("opengl renderer %p detaching functor %p", this, functor);
     mFunctors.remove(functor);
 }
 
@@ -303,7 +302,7 @@ status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
 
 status_t OpenGLRenderer::callDrawGLFunction(Functor* functor, Rect& dirty) {
     interrupt();
-    mFunctors.remove(functor);
+    detachFunctor(functor);
 
     if (mDirtyClip) {
         setScissorFromClip();