Make lines a special case in GrShape

src/gpu/GrDrawContext.cpp

Index: src/gpu/GrDrawContext.cpp
diff --git a/src/gpu/GrDrawContext.cpp b/src/gpu/GrDrawContext.cpp
index 7ee4e620e58ce040d9cddd1b1f7d51a0cf779a06..eec1389a81f8d6626aa9cbea3059f148097ca626 100644
--- a/src/gpu/GrDrawContext.cpp
+++ b/src/gpu/GrDrawContext.cpp
@@ -976,6 +976,9 @@ void GrDrawContext::internalDrawPath(const GrClip& clip,
                       : GrPathRendererChain::kColor_DrawType;
 
     GrShape shape(path, style);
+    if (shape.isEmpty()) {
+        return;
+    }
     GrPathRenderer::CanDrawPathArgs canDrawArgs;
     canDrawArgs.fShaderCaps = fDrawingManager->getContext()->caps()->shaderCaps();
     canDrawArgs.fViewMatrix = &viewMatrix;