Make setVertexAttribs in GrDrawState take a stride parameter.

gm/convexpolyeffect.cpp

Index: gm/convexpolyeffect.cpp
diff --git a/gm/convexpolyeffect.cpp b/gm/convexpolyeffect.cpp
index 00e89db2b170c0b4e05d6998c97e2eb762046552..275193f326435be3ae42c8c77df4944c32d19d49 100644
--- a/gm/convexpolyeffect.cpp
+++ b/gm/convexpolyeffect.cpp
@@ -127,7 +127,7 @@ protected:
                     return;
                 }
                 GrDrawState* drawState = tt.target()->drawState();
-                drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs));
+                drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs), sizeof(SkPoint));
 
                 SkMatrix m;
                 SkPath p;
@@ -193,7 +193,7 @@ protected:
                 }
 
                 GrDrawState* drawState = tt.target()->drawState();
-                drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs));
+                drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs), sizeof(SkPoint));
                 drawState->addCoverageEffect(effect, 1);
                 drawState->setIdentityViewMatrix();
                 drawState->setRenderTarget(rt);