Fix assertion error in SkPaint::computeFastBounds

Fix the crashes in the clusterfuzz: SkPaint::computeFastBounds failed
to check if the rect it computes on is finite.

Bug: 1041787

Change-Id: If7fc827fb20cbc5f23424b0bb087f39a680a7a21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008190Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738446}

cc/paint/paint_op_buffer.cc

@@ -2103,7 +2103,7 @@ gfx::Rect PaintOp::ComputePaintRect(const PaintOp* op,
     SkRect paint_rect = MapRect(ctm, op_rect);
     if (flags) {
       SkPaint paint = flags->ToSkPaint();
-      paint_rect = paint.canComputeFastBounds()
+      paint_rect = paint.canComputeFastBounds() && paint_rect.isFinite()
                        ? paint.computeFastBounds(paint_rect, &paint_rect)
                        : clip_rect;
     }