Skip temp texture when config conversion test has already failed.

include/gpu/GrContext.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrContext_DEFINED
 #define GrContext_DEFINED
 
@@ skipping 427 matching lines @@
 
     /**
      * These functions create premul <-> unpremul effects if it is possible to generate a pair
      * of effects that make a readToUPM->writeToPM->readToUPM cycle invariant. Otherwise, they
      * return NULL.
      */
     const GrFragmentProcessor* createPMToUPMEffect(GrProcessorDataManager*, GrTexture*,
                                                    bool swapRAndB, const SkMatrix&);
     const GrFragmentProcessor* createUPMToPMEffect(GrProcessorDataManager*, GrTexture*,
                                                    bool swapRAndB, const SkMatrix&);
+    /** Returns true if we've already determined that createPMtoUPMEffect and createUPMToPMEffect
+        will fail. In such cases fall back to SW conversion. */
+    bool didFailPMUPMConversionTest() const;
 
     /**
      *  This callback allows the resource cache to callback into the GrContext
      *  when the cache is still over budget after a purge.
      */
     static void OverBudgetCB(void* data);
 
     /**
      * A callback similar to the above for use by the TextBlobCache
      * TODO move textblob draw calls below context so we can use the call above.
      */
     static void TextBlobCacheOverBudgetCB(void* data);
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif