Make GrCacheable implement its own ref counting.

tests/ReadWriteAlphaTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test is specific to the GPU backend.
 #if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
 
@@ skipping 27 matching lines @@
         desc.fConfig    = kAlpha_8_GrPixelConfig;
         desc.fWidth     = X_SIZE;
         desc.fHeight    = Y_SIZE;
 
         // We are initializing the texture with zeros here
         GrTexture* texture = context->createUncachedTexture(desc, textureData, 0);
         if (!texture) {
             return;
         }
 
-        SkAutoUnref au(texture);
+        SkAutoTUnref<GrTexture> au(texture);
 
         // create a distinctive texture
         for (int y = 0; y < Y_SIZE; ++y) {
             for (int x = 0; x < X_SIZE; ++x) {
                 textureData[x][y] = x*Y_SIZE+y;
             }
         }
 
         // upload the texture
         texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
@@ skipping 44 matching lines @@
                     match = false;
                 }
             }
         }
 
         REPORTER_ASSERT(reporter, match);
     }
 }
 
 #endif