tell our grcontext to abandon its backend

samplecode/SampleApp.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleApp.h"
 
 #include "OverView.h"
@@ skipping 241 matching lines @@
 
             win->detach();
         }
 #endif // SK_SUPPORT_GPU
         // call windowSizeChanged to create the render target
         this->windowSizeChanged(win);
     }
 
     virtual void tearDownBackend(SampleWindow *win) {
 #if SK_SUPPORT_GPU
-        SkSafeUnref(fCurContext);
-        fCurContext = NULL;
+        if (fCurContext) {
+            // in case we have outstanding refs to this guy (lua?)
+            fCurContext->abandonContext();
+            fCurContext->unref();
+            fCurContext = NULL;
+        }
 
         SkSafeUnref(fCurIntf);
         fCurIntf = NULL;
 
         SkSafeUnref(fCurRenderTarget);
         fCurRenderTarget = NULL;
 #endif
         win->detach();
         fBackend = kNone_BackEndType;
     }
@@ skipping 2155 matching lines @@
     setenv("ANDROID_ROOT", "/android/device/data", 0);
 #endif
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }