Put caps in a struct, move up to GrDrawTarget

Review URL: http://codereview.appspot.com/5088049



git-svn-id: http://skia.googlecode.com/svn/trunk@2314 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrAAHairLinePathRenderer.cpp b/gpu/src/GrAAHairLinePathRenderer.cpp
index 8349fa7..4d05a6b 100644
--- a/gpu/src/GrAAHairLinePathRenderer.cpp
+++ b/gpu/src/GrAAHairLinePathRenderer.cpp
@@ -87,7 +87,7 @@
 }
 
 bool GrAAHairLinePathRenderer::CanBeUsed(const GrContext* context) {
-    return context->getGpu()->supportsShaderDerivatives();
+    return context->getGpu()->getCaps().fShaderDerivativeSupport;
 
 }