Add mixed samples support to XPs

src/gpu/GrPipelineBuilder.cpp

Index: src/gpu/GrPipelineBuilder.cpp
diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 8af89e8c1486588433b3391018341828e45b0327..26422fd5475900a8dbf9812230542c5d4f1903f9 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -89,7 +89,8 @@ void GrPipelineBuilder::setFromPaint(const GrPaint& paint, GrRenderTarget* rt, c
 bool GrPipelineBuilder::willXPNeedDstTexture(const GrCaps& caps,
                                              const GrProcOptInfo& colorPOI,
                                              const GrProcOptInfo& coveragePOI) const {
-    return this->getXPFactory()->willNeedDstTexture(caps, colorPOI, coveragePOI);
+    return this->getXPFactory()->willNeedDstTexture(caps, colorPOI, coveragePOI,
+                                                    this->hasMixedSamples());
 }
 
 void GrPipelineBuilder::AutoRestoreFragmentProcessors::set(GrPipelineBuilder* pipelineBuilder) {