Move GrGLExtensions from GrGLContextInfo to GrGLInterface

include/gpu/gl/GrGLFunctions.h

Index: include/gpu/gl/GrGLFunctions.h
diff --git a/include/gpu/gl/GrGLFunctions.h b/include/gpu/gl/GrGLFunctions.h
index beb657d30a1f578fbe69107faf504efe4a0758b4..1e4324afb2a381fa604f7cd46db0fef175fa583a 100644
--- a/include/gpu/gl/GrGLFunctions.h
+++ b/include/gpu/gl/GrGLFunctions.h
@@ -11,12 +11,27 @@
 
 #include "GrGLConfig.h"
 
+////////////////////////////////////////////////////////////////////////////////
+
 /**
- * Declares typedefs for all the GL functions used in GrGLInterface
+ * Classifies GL contexts by which standard they implement (currently as Desktop
+ * vs. ES).
  */
+enum GrGLStandard {
+    kNone_GrGLStandard,
+    kGL_GrGLStandard,
+    kGLES_GrGLStandard,
+};
+
+// Temporary alias until Chromium can be updated.
+static const GrGLStandard kES2_GrGLBinding = kGLES_GrGLStandard;
 
 ///////////////////////////////////////////////////////////////////////////////
 
+/**
+ * Declares typedefs for all the GL functions used in GrGLInterface
+ */
+
 typedef unsigned int GrGLenum;
 typedef unsigned char GrGLboolean;
 typedef unsigned int GrGLbitfield;