Modify GrClipMaskManager to reflect logical constness

include/gpu/GrProcessorDataManager.h

Index: include/gpu/GrProcessorDataManager.h
diff --git a/include/gpu/GrProcessorDataManager.h b/include/gpu/GrProcessorDataManager.h
index 4e8bb7d846f78129f732328ec1df7f7bf76c8297..2b41dc66293543998d61422444bde49a9ffb8baa 100644
--- a/include/gpu/GrProcessorDataManager.h
+++ b/include/gpu/GrProcessorDataManager.h
@@ -26,6 +26,12 @@ public:
     }
 
 private:

[robertphillips, 2015/07/10 14:34:09]

I'm not crazy about 'height' here

+    uint32_t currentHeight() const { return 0; }
+    void restoreHeight(uint32_t height) {}
+
+    // For GrPipelineBuilder::AutoRestoreProcessorDataManager
+    friend class GrPipelineBuilder;
+
     typedef SkRefCnt INHERITED;
 };