Add "sample locations" feature to GrProcessor

src/gpu/GrRenderTarget.cpp

Index: src/gpu/GrRenderTarget.cpp
diff --git a/src/gpu/GrRenderTarget.cpp b/src/gpu/GrRenderTarget.cpp
index e547021227724d03e11ab0bb4c9053989eb8288e..51282b47ee92430f50bd797c08e8cadc65b977f3 100644
--- a/src/gpu/GrRenderTarget.cpp
+++ b/src/gpu/GrRenderTarget.cpp
@@ -105,3 +105,17 @@ bool GrRenderTargetPriv::attachStencilAttachment(GrStencilAttachment* stencil) {
     } 
     return true;
 }
+
+int GrRenderTargetPriv::getEffectiveSampleCount(const GrStencilSettings& stencil) const {
+    return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil).fEffectiveSampleCnt;
+}
+
+uint16_t GrRenderTargetPriv::getSamplePatternID(const GrStencilSettings& stencil) const {
+    SkASSERT(fRenderTarget->getGpu()->caps()->sampleLocationsSupport());
+    return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil).fSamplePatternID;
+}
+
+const SkPoint* GrRenderTargetPriv::getSampleLocations(const GrStencilSettings& stencil) const {
+    SkASSERT(fRenderTarget->getGpu()->caps()->sampleLocationsSupport());
+    return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil).fSampleLocations;
+}