Add XferProcessor factory in GrPaint and GrDrawState.

src/gpu/GrOptDrawState.cpp

Index: src/gpu/GrOptDrawState.cpp
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index a494b171de3a77e652191d0abf153ff548cd5586..c323e2ee9c2f89339d17df1e634e243d097b3e41 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -106,6 +106,12 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
              drawState.hasGeometryProcessor());
     fGeometryProcessor.reset(drawState.getGeometryProcessor());
 
+    // Create XferProcessor from DS's XPFactory
+    SkASSERT(drawState.hasXPFactory());
+    const GrXferProcessor* xpProcessor = drawState.getXPFactory()->createXferProcessor();
+    fXferProcessor.reset(xpProcessor);
+    SkSafeUnref(xpProcessor);

[bsalomon, 2014/11/26 21:02:45]

SkUnref() or ->unref(), no need for safety, right? Or can this the factory fail?
If so, do we not draw?

[egdaniel, 2014/12/01 18:18:24]

correct

+
     // Copy Stages from DS to ODS
     bool explicitLocalCoords = descInfo.hasLocalCoordAttribute();