Fix uninitialized fCurrProgramID in GrGLCreateNullInterface

src/gpu/gl/GrGLCreateNullInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "GrGLTestInterface.h"
@@ skipping 96 matching lines @@
 };
 
 /** Null interface implementation */
 class NullInterface : public GrGLTestInterface {
 public:
     NullInterface()
         : fCurrArrayBuffer(0)
         , fCurrElementArrayBuffer(0)
         , fCurrPixelPackBuffer(0)
         , fCurrPixelUnpackBuffer(0)
+        , fCurrProgramID(0)
         , fCurrShaderID(0)
         , fCurrGenericID(0)
         , fCurrUniformLocation(0) {
         this->init(kGL_GrGLStandard);
     }
 
     GrGLenum checkFramebufferStatus(GrGLenum target) override {
         return GR_GL_FRAMEBUFFER_COMPLETE;
     }
 
@@ skipping 478 matching lines @@
     "GL_ARB_timer_query",
     "GL_ARB_draw_buffers",
     "GL_ARB_occlusion_query",
     "GL_EXT_stencil_wrap",
     nullptr, // signifies the end of the array.
 };
 
 }  // anonymous namespace
 
 const GrGLInterface* GrGLCreateNullInterface() { return new NullInterface; }