Batch multiple single NVPR draw paths to instanced draws

src/gpu/gl/GrGLPath.cpp

Index: src/gpu/gl/GrGLPath.cpp
diff --git a/src/gpu/gl/GrGLPath.cpp b/src/gpu/gl/GrGLPath.cpp
index 46006558b9101939afd10ac715048b5fc423946a..de20c3c6cf7134ad4c8bfd96be631c1e536554d5 100644
--- a/src/gpu/gl/GrGLPath.cpp
+++ b/src/gpu/gl/GrGLPath.cpp
@@ -333,6 +333,12 @@ GrGLPath::GrGLPath(GrGLGpu* gpu, const SkPath& origSkPath, const GrStrokeInfo& o
     this->registerWithCache();
 }
 
+bool GrGLPath::canCombineDrawPathBatchWith(const GrPath& o) const {
+    const GrGLPath* other = static_cast<const GrGLPath*>(&o);
+    return fShouldStroke == other->fShouldStroke &&
+            fShouldFill == other->fShouldFill;
+}
+
 void GrGLPath::onRelease() {
     if (0 != fPathID && this->shouldFreeResources()) {
         static_cast<GrGLGpu*>(this->getGpu())->glPathRendering()->deletePaths(fPathID, 1);