Move some of the adding stencil attachment logic of Gpu and into Render Target.

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 076b626a1ac040602d2bf627b6e8e7b26b913951..3d5f4288f441311c36b4e0e7bf5a7e1380c0c1b4 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -215,7 +215,7 @@ void GrDrawTarget::stencilPath(const GrPipelineBuilder& pipelineBuilder,
     // set stencil settings for path
     GrStencilSettings stencilSettings;
     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
-    GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
+    GrStencilAttachment* sb = fResourceProvider->attachStencilAttachment(rt);
     this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);
 
     GrBatch* batch = GrStencilPathBatch::Create(viewMatrix,
@@ -270,7 +270,7 @@ void GrDrawTarget::drawPathBatch(const GrPipelineBuilder& pipelineBuilder,
     // Ensure the render target has a stencil buffer and get the stencil settings.
     GrStencilSettings stencilSettings;
     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
-    GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
+    GrStencilAttachment* sb = fResourceProvider->attachStencilAttachment(rt);
     this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);
     batch->setStencilSettings(stencilSettings);