"interface" is defined in Windows headers, so undef it in GrGLCaps so we don't have a name collision

src/gpu/gl/GrGLCaps.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLCaps_DEFINED
 #define GrGLCaps_DEFINED
@@ skipping 96 matching lines @@
 
     /**
      * Resets the caps such that nothing is supported.
      */
     virtual void reset() SK_OVERRIDE;
 
     /**
      * Initializes the GrGLCaps to the set of features supported in the current
      * OpenGL context accessible via ctxInfo.
      */
-    bool init(const GrGLContextInfo& ctxInfo, const GrGLInterface* interface);
+    bool init(const GrGLContextInfo& ctxInfo, const GrGLInterface* glInterface);
 
     /**
      * Call to note that a color config has been verified as a valid color
      * attachment. This may save future calls to glCheckFramebufferStatus
      * using isConfigVerifiedColorAttachment().
      */
     void markConfigAsValidColorAttachment(GrPixelConfig config) {
         fVerifiedColorConfigs.markVerified(config);
     }
 
@@ skipping 233 matching lines @@
     bool fVertexArrayObjectSupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fFullClearIsFree : 1;
     bool fDropsTileOnZeroDivide : 1;
 
     typedef GrDrawTargetCaps INHERITED;
 };
 
 #endif