Change to create device coord coordset

BUG=skia:

Review URL: https://codereview.chromium.org/812063002
diff --git a/src/gpu/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index 0f4b70d..f8770b3 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -32,7 +32,8 @@
     SkMatrix combined;
 
     if (kLocal_GrCoordSet == coordTransform.sourceCoords()) {
-        // If we have explicit local coords then we shouldn't need a coord change.
+        // If we have explicit local coords or are in device coords then we shouldn't need a coord
+        // change.
         const SkMatrix& ccm = stage.getCoordChangeMatrix();
         combined.setConcat(coordTransform.getMatrix(), ccm);
     } else {