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..f39d55b1274012865bee13b488fd42e01f4bc6aa 100644
--- a/src/gpu/GrRenderTarget.cpp
+++ b/src/gpu/GrRenderTarget.cpp
@@ -105,3 +105,8 @@ bool GrRenderTargetPriv::attachStencilAttachment(GrStencilAttachment* stencil) {
     } 
     return true;
 }
+
+const GrRenderTargetPriv::MultisampleSpecs&
+GrRenderTargetPriv::getMultisampleSpecs(const GrStencilSettings& stencil) {
+    return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil);
+}