Minor modifications to GrProgramDesc.h.

src/gpu/gl/GrGLProgramDesc.h

Index: src/gpu/gl/GrGLProgramDesc.h
diff --git a/src/gpu/gl/GrGLProgramDesc.h b/src/gpu/gl/GrGLProgramDesc.h
index f2371556bfaf19a178b67594795ba92144316201..a10b0e8875249238d7c44cb75a6ba350fe9b0926 100644
--- a/src/gpu/gl/GrGLProgramDesc.h
+++ b/src/gpu/gl/GrGLProgramDesc.h
@@ -14,6 +14,11 @@
 #include "GrTypesPriv.h"
 
 class GrGLGpu;
+class GrGLProgramDescBuilder;
+
+class GrGLProgramDesc : public GrProgramDesc {
+    friend class GrGLProgramDescBuilder;
+};
 
 /**
  * This class can be used to build a GrProgramDesc.  It also provides helpers for accessing
@@ -30,7 +35,7 @@ public:
     //    Each processor's key is a variable length array of uint32_t.
     enum {
         // Part 3.
-        kHeaderOffset = GrProgramDesc::kHeaderOffset,
+        kHeaderOffset = GrGLProgramDesc::kHeaderOffset,
         kHeaderSize = SkAlign4(sizeof(KeyHeader)),
         // Part 4.
         // This is the offset into the backenend specific part of the key, which includes