Add function for logging blend info on XP.

Review URL: https://codereview.chromium.org/1132373003
diff --git a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
index 8fcb0b9..044752f 100644
--- a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
@@ -74,7 +74,7 @@
     GR_STATIC_ASSERT(13 == kHSLColor_GrBlendEquation - kFirstAdvancedGrBlendEquation);
     GR_STATIC_ASSERT(14 == kHSLLuminosity_GrBlendEquation - kFirstAdvancedGrBlendEquation);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayoutQualifierNames) ==
-                     kTotalGrBlendEquationCount - kFirstAdvancedGrBlendEquation);
+                     kGrBlendEquationCnt - kFirstAdvancedGrBlendEquation);
 }
 
 GrGLFragmentShaderBuilder::DstReadKey