Fix leaks in unit tests of GrGLTextureInfos

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 345 matching lines @@
         void incShaderCompilations() {}
         void incTextureCreates() {}
         void incTextureUploads() {}
         void incStencilAttachmentCreates() {}
         void incNumDraws() {}
 #endif
     };
 
     Stats* stats() { return &fStats; }
 
-    // creation and deletion of raw texture for testing
-    // only to be used in GPU-specific tests
+    /** Creates a texture directly in the backend API without wrapping it in a GrTexture. This is
+        only to be used for testing (particularly for testing the methods that import an externally
+        created texture into Skia. Must be matched with a call to deleteTestingOnlyTexture(). */
     virtual GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                                             GrPixelConfig config) const = 0;
-    virtual bool isTestingOnlyBackendTexture(GrBackendObject id) const = 0;
-    virtual void deleteTestingOnlyBackendTexture(GrBackendObject id) const = 0;
+    /** Check a handle represents an actual texture in the backend API that has not been freed. */
+    virtual bool isTestingOnlyBackendTexture(GrBackendObject) const = 0;
+    /** If ownership of the backend texture has been transferred pass true for abandonTexture. This
+        will do any necessary cleanup of the handle without freeing the texture in the backend
+        API. */
+    virtual void deleteTestingOnlyBackendTexture(GrBackendObject,
+                                                 bool abandonTexture = false) const = 0;
 
     // width and height may be larger than rt (if underlying API allows it).
     // Returns nullptr if compatible sb could not be created, otherwise the caller owns the ref on
     // the GrStencilAttachment.
     virtual GrStencilAttachment* createStencilAttachmentForRenderTarget(const GrRenderTarget*,
                                                                         int width,
                                                                         int height) = 0;
     // clears target's entire stencil buffer to 0
     virtual void clearStencil(GrRenderTarget* target) = 0;
 
@@ skipping 113 matching lines @@
     ResetTimestamp                                                      fResetTimestamp;
     uint32_t                                                            fResetBits;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif