Allow GrGLInterface factories in Chromium to continue to compile.

BUG=skia:2042
TBR=jvanverth@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/136573003

git-svn-id: http://skia.googlecode.com/svn/trunk@13112 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index 2471da9..857a272 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -23,8 +23,10 @@
     kGLES_GrGLStandard,
 };
 
-// Temporary alias until Chromium can be updated.
+// Temporary aliases until Chromium can be updated.
+typedef GrGLStandard GrGLBinding;
 static const GrGLStandard kES2_GrGLBinding = kGLES_GrGLStandard;
+static const GrGLStandard kDesktop_GrGLBinding = kGL_GrGLStandard;
 
 ////////////////////////////////////////////////////////////////////////////////