Create a static instances of SrcOver XferProcessor

src/gpu/GrPipeline.h

Index: src/gpu/GrPipeline.h
diff --git a/src/gpu/GrPipeline.h b/src/gpu/GrPipeline.h
index 8781058247fe438300ac2f5cb919c389aea31c1b..321b73733fc1eebe75a9ee819f5dbae195fb7e76 100644
--- a/src/gpu/GrPipeline.h
+++ b/src/gpu/GrPipeline.h
@@ -141,6 +141,7 @@ public:
     ///////////////////////////////////////////////////////////////////////////
 
     bool readsFragPosition() const { return fReadsFragPosition; }
+    bool readsCoverage() const { return fReadsCoverage; }
 
 private:
     GrPipeline() { /** Initialized in factory function*/ }
@@ -180,6 +181,7 @@ private:
     ProgramXferProcessor                fXferProcessor;
     FragmentProcessorArray              fFragmentProcessors;
     bool                                fReadsFragPosition;
+    bool                                fReadsCoverage; // Will this program use coverage?

[bsalomon, 2015/11/30 15:56:53]

Given that this is now moved from XP to Pipeline, maybe it should a new name
that is more explicit? fXPUsesCoverage? 

[egdaniel, 2015/11/30 16:29:14]

Done.

 
     // This value is also the index in fFragmentProcessors where coverage processors begin.
     int                                 fNumColorProcessors;