added stroking support to GrAALinearizingConvexPathRenderer

src/gpu/GrAAConvexPathRenderer.cpp

Index: src/gpu/GrAAConvexPathRenderer.cpp
diff --git a/src/gpu/GrAAConvexPathRenderer.cpp b/src/gpu/GrAAConvexPathRenderer.cpp
index 45a4ca37831532d86f42b9f5507d934fe4222c0d..5a789bc6814be8881e4fcd3c3d49e5c8be901790 100644
--- a/src/gpu/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/GrAAConvexPathRenderer.cpp
@@ -708,16 +708,15 @@ static void extract_verts(const GrAAConvexTessellator& tess,
     // Make 'verts' point to the colors
     verts += sizeof(SkPoint);
     for (int i = 0; i < tess.numPts(); ++i) {
-        SkASSERT(tess.depth(i) >= -0.5f && tess.depth(i) <= 0.5f);
         if (tweakAlphaForCoverage) {
-            SkASSERT(SkScalarRoundToInt(255.0f * (tess.depth(i) + 0.5f)) <= 255);
-            unsigned scale = SkScalarRoundToInt(255.0f * (tess.depth(i) + 0.5f));
+            SkASSERT(SkScalarRoundToInt(255.0f * tess.coverage(i)) <= 255);
+            unsigned scale = SkScalarRoundToInt(255.0f * tess.coverage(i));
             GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
             *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
         } else {
             *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
             *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 
-                                                                    tess.depth(i) + 0.5f;
+                    tess.coverage(i);
         }
     }