Set up cache in vulkan to reuse GrVkPrograms (aka VkPipelines)

src/gpu/vk/GrVkUniformHandler.h

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef GrVkUniformHandler_DEFINED
 #define GrVkUniformHandler_DEFINED
 
@@ skipping 59 matching lines @@
     const UniformInfo& getUniformInfo(UniformHandle u) const {
         return fUniforms[u.toIndex()];
     }
 
 
     UniformInfoArray fUniforms;
     uint32_t         fCurrentVertexUBOOffset;
     uint32_t         fCurrentFragmentUBOOffset;
     uint32_t         fCurrentSamplerBinding;
 
-    friend class GrVkProgramBuilder;
+    friend class GrVkPipelineStateBuilder;
 
     typedef GrGLSLUniformHandler INHERITED;
 };
 
 #endif