Fix leaks in unit tests of GrGLTextureInfos

tests/SurfaceTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkDevice.h"
@@ skipping 151 matching lines @@
         stop = false;
         for (int y = kH/2; y < kH && !stop; ++y) {
             for (int x = 0; x < kW && !stop; ++x) {
                 REPORTER_ASSERT(reporter, origColorPM == pixels[x + y * kW]);
                 if (origColorPM != pixels[x + y * kW]) {
                     stop = true;
                 }
             }
         }
     }
+    gpu->deleteTestingOnlyBackendTexture(texHandle);
+
 }
 #endif
 
 
 static void test_image(skiatest::Reporter* reporter) {
     SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
     size_t rowBytes = info.minRowBytes();
     size_t size = info.getSafeSize(rowBytes);
     SkData* data = SkData::NewUninitialized(size);
 
@@ skipping 840 matching lines @@
     test_image_color(reporter, refImg, expected1);
 #endif
     test_image_color(reporter, cpyImg, expected0);
 
     // Now exercise the release proc
     REPORTER_ASSERT(reporter, !releaseCtx.fIsReleased);
     refImg.reset(nullptr); // force a release of the image
     REPORTER_ASSERT(reporter, releaseCtx.fIsReleased);
 }
 #endif