Remove Pattern-wrapper in GeneratedImage::DrawPattern

Don't create a Pattern just to have it create a PaintShader - just
create the PaintShader directly.

Change-Id: I85b96ed9becea31e93d62191baac263f08f53f91
Reviewed-on: https://chromium-review.googlesource.com/c/1352258
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611258}
1 file changed