Move DrawInfo out from GrDrawTarget and rename to GrVertices.

Review URL: https://codereview.chromium.org/1124733004
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 23739f2..dfec048 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -200,7 +200,7 @@
 
     void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) override {}
 
-    void onDraw(const DrawArgs&, const GrDrawTarget::DrawInfo&) override {}
+    void onDraw(const DrawArgs&, const GrVertices&) override {}
 
     void onStencilPath(const GrPath* path, const StencilPathState& state) override {}