Make the debug interface a GrGLTestInterface subclass.

gm/rectangletexture.cpp

 
 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
@@ skipping 69 matching lines @@
             format = GR_GL_BGRA;
         } else {
             SkASSERT(kSkia8888_GrPixelConfig == kRGBA_8888_GrPixelConfig);
             format = GR_GL_RGBA;
         }
 
         const GrGLInterface* gl = glCtx->interface();
 // Useful for debugging whether errors result from use of RECTANGLE
 // #define TARGET GR_GL_TEXTURE_2D
 #define TARGET GR_GL_TEXTURE_RECTANGLE
-        GrGLuint id;
+        GrGLuint id = 0;
         GR_GL_CALL(gl, GenTextures(1, &id));
         GR_GL_CALL(gl, BindTexture(TARGET, id));
         GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_MAG_FILTER,
                                      GR_GL_NEAREST));
         GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_MIN_FILTER,
                                      GR_GL_NEAREST));
         GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_WRAP_S,
                                      GR_GL_CLAMP_TO_EDGE));    
         GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_WRAP_T,
                                      GR_GL_CLAMP_TO_EDGE));
@@ skipping 81 matching lines @@
     }
 
 private:
     typedef GM INHERITED;
 };
 
 DEF_GM(return new RectangleTexture;)
 }
 
 #endif