Implement stroking a path with nv_path_rendering

src/gpu/gl/GrGLPath.h

Index: src/gpu/gl/GrGLPath.h
diff --git a/src/gpu/gl/GrGLPath.h b/src/gpu/gl/GrGLPath.h
index dfe3405443cd99f418db1e58e92f91d1071f1c67..ef3aa567ad4c67710b66f4db17e2596b5712085c 100644
--- a/src/gpu/gl/GrGLPath.h
+++ b/src/gpu/gl/GrGLPath.h
@@ -14,6 +14,7 @@
 
 class GrGpuGL;
 class SkPath;
+class SkStrokeRec;
 
 /**
  * Currently this represents a path built using GL_NV_path_rendering. If we
@@ -23,7 +24,7 @@ class SkPath;
 
 class GrGLPath : public GrPath {
 public:
-    GrGLPath(GrGpuGL* gpu, const SkPath& path);
+    GrGLPath(GrGpuGL* gpu, const SkPath& path, const SkStrokeRec& stroke);
     virtual ~GrGLPath();
     GrGLuint pathID() const { return fPathID; }
     // TODO: Figure out how to get an approximate size of the path in Gpu