Revert "Quality and performance fixes for AA tessellating path renderer."

Revert "Quality and performance fixes for AA tessellating path renderer."

This reverts commit d4b21552481a6d313dfa9bc14b624c9ec94b56ce.

Reason for revert: accidentally added some unwanted changes

Original change's description:
> Quality and performance fixes for AA tessellating path renderer.
>
> Use quads rather than triangles for the edge geometry. This allows
> us to perform a simpler edge categorization (see below). It also
> improves performance by reducing the number of edges processed during
> the simplify and tessellate steps.
>
> Label AA edges as three types: inner, outer, and connector. This
> results in correct alpha values for intersected edges, even when
> the top or bottom vertex has been merged with a vertex on edges
> of different types.
>
> Changed the "collinear edges" sample from the concavepaths GM for a
> "fast-foward" shape, which more clearly shows the problem being fixed
> here. (The collinearity from the "collinear edges" was actually being
> removed earlier up the stack, causing the path to become convex and
> not exercise the concave path renderers anyway.)
>
> NOTE: this will cause changes in the "concavepaths" GM results, and
> minor pixel diffs in a number of other tests.
>
> BUG=660893
>
> Change-Id: Ide49374d6d173404c7223f7316dd439df1435787
> Reviewed-on: https://skia-review.googlesource.com/6427
> Commit-Queue: Stephan White <senorblanco@chromium.org>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
>

TBR=bsalomon@google.com,senorblanco@chromium.org,reviews@skia.org
BUG=660893
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I06a36e397645bfc42442a5a9e7c27328f6048ab9
Reviewed-on: https://skia-review.googlesource.com/6428
Commit-Queue: Stephan White <senorblanco@chromium.org>
Reviewed-by: Stephan White <senorblanco@chromium.org>