switch over to SkVertices object, and stop using deprecated methods.

This allows Skia to remove
  SK_SUPPORT_LEGACY_CANVAS_VERTICES
  SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
  SK_SUPPORT_LEGACY_PIXELREFFACTORY

Test: Existing CTS cover these changes

Running CtsGraphicsTestCases, there were 6 failures w/ and w/o this CL.
None of the 6 seems related to this CL.

Change-Id: I724082357d9f6cb699770df3c0b9ef555b957697
diff --git a/libs/hwui/SkiaCanvas.h b/libs/hwui/SkiaCanvas.h
index c20c7dba..be958c4 100644
--- a/libs/hwui/SkiaCanvas.h
+++ b/libs/hwui/SkiaCanvas.h
@@ -117,9 +117,7 @@
     virtual void drawArc(float left, float top, float right, float bottom,
             float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override;
     virtual void drawPath(const SkPath& path, const SkPaint& paint) override;
-    virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
-            const float* verts, const float* tex, const int* colors,
-            const uint16_t* indices, int indexCount, const SkPaint& paint) override;
+    virtual void drawVertices(const SkVertices*, SkBlendMode, const SkPaint& paint) override;
 
     virtual void drawBitmap(Bitmap& bitmap, float left, float top, const SkPaint* paint) override;
     virtual void drawBitmap(Bitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) override;