Add SkBlendARGB32_SSE2() to clean up code

Related nanobench results:
before:
maxrss  loops   min     median  mean    max     stddev  samples         config  bench
  10M   2       31.9µs  32.4µs  33.3µs  38.7µs  6%      █▄▂▂▂▁▂▁▁▁      8888    bitmap_BGRA_8888_A_scale_bicubic
  10M   13      43.8µs  51.8µs  49.6µs  57.9µs  11%     ▁▁▁▁▂▆▇▆▅█      8888    bitmap_BGRA_8888_A_scale_bilerp
  10M   13      23.7µs  24.3µs  26µs    32.7µs  13%     ▅█▆▁▁▁▁▂▁▁      8888    bitmap_Index_8_A
  10M   4       1.68µs  1.7µs   4.09µs  25.4µs  183%    █▁▁▁▁▁▁▁▁▁      8888    text_16_AA_88
  10M   144     1.76µs  1.77µs  1.78µs  1.81µs  1%      █▂▇▂▅▁▁▁▁▁      8888    text_16_AA_FF
  10M   10      4.7µs   5.34µs  5.61µs  8.63µs  21%     █▂▂▃▂▁▁▁▁▄      8888    rotated_rects_aa_alternating_transparent_and_opaque_src
  10M   50      4.44µs  4.47µs  4.5µs   4.71µs  2%      █▅▃▂▂▂▁▁▁▁      8888    rotated_rects_aa_changing_opaque_src
  10M   51      4.39µs  4.78µs  5.21µs  6.62µs  17%     ▁▆▆▇▁▁█▁▂▂      8888    rotated_rects_aa_same_opaque_src
  10M   50      4.47µs  5.79µs  5.43µs  6.14µs  11%     ▄▂▁▃▇▇▆▇▇█      8888    rotated_rects_aa_alternating_transparent_and_opaque_srcover
  10M   30      4.35µs  6.06µs  5.84µs  7.63µs  16%     ▅▅▅▄▅▅▄█▁▁      8888    rotated_rects_aa_changing_transparent_srcover
  10M   44      4.31µs  4.51µs  4.76µs  6.25µs  13%     ▄▂▂▁█▃▁▃▁▁      8888    rotated_rects_aa_changing_opaque_srcover
  10M   46      4.36µs  4.42µs  4.75µs  6.19µs  14%     ▆█▃▁▁▁▁▁▁▁      8888    rotated_rects_aa_same_transparent_srcover
  10M   47      4.29µs  4.35µs  4.44µs  5.15µs  6%      ▃▂▂▁▁█▁▁▁▁      8888    rotated_rects_aa_same_opaque_srcover
  10M   3       39.1µs  39.2µs  50.7µs  153µs   71%     █▁▁▁▁▁▁▁▁▁      8888    rectori
  10M   1       2.3ms   2.31ms  2.35ms  2.74ms  6%      ▁▁▁▁▁▁▁▁█▂      8888    maskcolor
  10M   1       2.33ms  2.34ms  2.53ms  3.14ms  11%     ▁▁▁▁▁▁▅█▄▄      8888    maskopaque
  10M   11      15µs    15.3µs  15.7µs  18.3µs  7%      ▅▃▂▂▁▁▁▁█▁      8888    rrects_3_stroke_4
  10M   46      3.99µs  4.07µs  4.14µs  4.54µs  4%      █▅▅▃▂▂▁▁▁▁      8888    rrects_3
  10M   16      15.6µs  15.9µs  16.1µs  17.5µs  4%      █▄▃▂▂▂▁▂▁▁      8888    ovals_3_stroke_4
  10M   40      5.09µs  5.18µs  5.23µs  5.67µs  3%      █▅▃▂▂▁▃▁▁▁      8888    ovals_3
  10M   231     1.92µs  1.93µs  1.94µs  2µs     1%      █▃▂▁▃▁▁▁▁▁      8888    zeroradroundrect
  10M   924     3.88µs  3.93µs  4.11µs  4.95µs  9%      ▁█▆▃▁▁▁▁▁▁      8888    arbroundrect
  10M   8       8.11µs  8.47µs  8.48µs  8.85µs  3%      █▅▇▄▄▂▁▄▄▆      8888    merge_large
  10M   14      6.71µs  6.92µs  6.96µs  7.46µs  3%      ▃▆▁█▃▃▃▂▂▁      8888    merge_small
  11M   2       225µs   227µs   229µs   233µs   1%      ███▃▇▂▃▁▃▂      8888    displacement_full_large
  16M   1       381µs   401µs   401µs   421µs   3%      ▅▅▅█▆▄▄▃▃▁      8888    displacement_alpha_large
  19M   1       507µs   508µs   509µs   512µs   0%      █▃▂▆▂▂▃▂▃▁      8888    displacement_zero_large
  19M   19      9µs     9.11µs  9.15µs  9.67µs  2%      ▄▂▂▂█▂▁▁▁▂      8888    displacement_full_small
  19M   5       54.2µs  54.5µs  54.9µs  58µs    2%      █▃▂▂▁▁▃▁▁▁      8888    blurroundrect_WH[100x100]_cr[90]
  20M   1       229µs   230µs   231µs   240µs   2%      █▄▃▂▂▁▁▁▁▂      8888    GM_varied_text_clipped_no_lcd
  20M   1       267µs   269µs   270µs   279µs   1%      █▄▃▂▂▂▂▂▁▁      8888    GM_varied_text_ignorable_clip_no_lcd
  22M   1       1.95ms  1.97ms  2.03ms  2.46ms  8%      ▁▁▁▁▁▁▁▂█▃      8888    GM_convex_poly_clip

after:
maxrss	loops	min	median	mean	max	stddev	samples   	config	bench
  10M	2	31.5µs	32.3µs	32.8µs	37.2µs	5%	█▄▃▂▂▂▁▁▁▁	8888	bitmap_BGRA_8888_A_scale_bicubic
  10M	13	43.9µs	44µs	44.1µs	44.9µs	1%	█▂▁▁▁▆▁▁▁▂	8888	bitmap_BGRA_8888_A_scale_bilerp
  10M	19	22.7µs	23.3µs	25.6µs	32.4µs	14%	▁▁▁▁▁▅▆▁▅█	8888	bitmap_Index_8_A
  10M	5	1.79µs	1.97µs	3.85µs	21.1µs	158%	█▁▁▁▁▁▁▁▁▁	8888	text_16_AA_88
  10M	141	1.83µs	1.83µs	1.85µs	1.93µs	2%	▅▁▁█▁▁▁▁▁▁	8888	text_16_AA_FF
  10M	10	4.65µs	4.92µs	5.06µs	6.56µs	11%	█▃▃▂▂▂▁▁▁▁	8888	rotated_rects_aa_alternating_transparent_and_opaque_src
  10M	51	4.35µs	4.48µs	4.83µs	6.68µs	17%	▂▁▁▁▁▁▁▂▆█	8888	rotated_rects_aa_changing_opaque_src
  10M	51	4.38µs	4.79µs	4.85µs	5.84µs	11%	▁█▁▃▃▁▄▁▄▇	8888	rotated_rects_aa_same_opaque_src
  10M	32	5.58µs	6.24µs	6.1µs	6.39µs	5%	█▂█▆▁▇▄▅▇▇	8888	rotated_rects_aa_alternating_transparent_and_opaque_srcover
  10M	42	4.28µs	5.59µs	5.11µs	6.01µs	15%	▂▂█▇█▂▁▆▁▇	8888	rotated_rects_aa_changing_transparent_srcover
  10M	48	4.24µs	4.33µs	4.58µs	6.46µs	15%	▁▁▁▁▁█▃▂▁▁	8888	rotated_rects_aa_changing_opaque_srcover
  10M	48	4.28µs	4.3µs	4.4µs	5.12µs	6%	▂▂▁▁▁▁▁▁▁█	8888	rotated_rects_aa_same_transparent_srcover
  10M	46	4.24µs	4.29µs	4.66µs	7.11µs	20%	▁▁▁▁▁▁▁▁▃█	8888	rotated_rects_aa_same_opaque_srcover
  10M	3	39.3µs	39.4µs	51.4µs	154µs	70%	█▁▁▁▁▁▁▁▁▁	8888	rectori
  10M	1	2.32ms	2.43ms	2.53ms	3.14ms	11%	▁▁▁▁▂▄█▃▅▁	8888	maskcolor
  10M	1	2.33ms	2.37ms	2.54ms	3.21ms	12%	▁▁▁▁▁▂█▅▆▁	8888	maskopaque
  10M	10	15.3µs	15.6µs	15.8µs	17.2µs	4%	█▅▃▂▂▂▁▁▁▁	8888	rrects_3_stroke_4
  10M	46	4.03µs	4.09µs	4.15µs	4.47µs	4%	█▄▆▂▂▂▁▁▁▁	8888	rrects_3
  10M	15	15.9µs	16.2µs	16.3µs	17.8µs	4%	█▄▃▂▂▂▁▁▁▁	8888	ovals_3_stroke_4
  10M	40	5.14µs	5.26µs	5.29µs	5.72µs	3%	█▅▃▂▂▁▂▂▁▁	8888	ovals_3
  10M	222	1.91µs	1.99µs	2.21µs	2.91µs	19%	▂▁▁▁▁▁▂▇▇█	8888	zeroradroundrect
  10M	462	3.9µs	3.96µs	4.23µs	5.22µs	12%	▆▄█▁▂▁▁▁▁▁	8888	arbroundrect
  10M	8	8.2µs	8.59µs	8.62µs	8.97µs	3%	▆▄█▄▅▃▁▆▄█	8888	merge_large
  10M	14	6.73µs	6.88µs	6.86µs	7.08µs	2%	▄█▁▂▄▂▅▄▂▅	8888	merge_small
  11M	2	221µs	234µs	237µs	263µs	5%	▄▃▃▃▄▃▂▁▇█	8888	displacement_full_large
  16M	1	387µs	416µs	427µs	471µs	7%	▇█▁▃▃▁▃▃▇▆	8888	displacement_alpha_large
  19M	1	512µs	521µs	528µs	594µs	5%	█▂▂▂▁▁▂▃▁▁	8888	displacement_zero_large
  19M	18	9.06µs	9.12µs	9.13µs	9.23µs	1%	█▃▃▃▄▃▆▁▅▅	8888	displacement_full_small
  19M	5	55.6µs	55.9µs	56.5µs	59.5µs	2%	█▃▂▁▁▁▁▁▅▁	8888	blurroundrect_WH[100x100]_cr[90]
  20M	1	229µs	233µs	235µs	254µs	3%	█▄▃▂▂▁▁▂▁▁	8888	GM_varied_text_clipped_no_lcd
  20M	1	270µs	271µs	272µs	278µs	1%	█▄▃▂▂▂▁▂▁▇	8888	GM_varied_text_ignorable_clip_no_lcd
  22M	1	1.96ms	2ms	2.06ms	2.45ms	7%	▂▂▁▁▁▁▁▃█▄	8888	GM_convex_poly_clip

BUG=skia:

Review URL: https://codereview.chromium.org/754733002
Optimize highQualityFilter

portable version:
before:
  10M   1       806µs   807µs   810µs   821µs   1%      █▂▁▁▃▁▁▁█▁ 8888    bitmap_BGRA_8888_A_scale_rotate_bicubic
after:
  10M   1       566µs   568µs   569µs   579µs   1%      ▄▂▂█▂▁▁▁▃▁ 8888    bitmap_BGRA_8888_A_scale_rotate_bicubic

SSE version:
before:
  10M   1       485µs   486µs   487µs   494µs   1%      ▇▂▁▁▁▁█▂▁▁ 8888    bitmap_BGRA_8888_A_scale_rotate_bicubic
after:
  10M   1       419µs   420µs   421µs   430µs   1%      ▅▃▂▁▁█▂▁▁▁ 8888    bitmap_BGRA_8888_A_scale_rotate_bicubic

BUG=skia:

Review URL: https://codereview.chromium.org/759603002
Revert of Blink hasn't rolled yet, better. (patchset #1 id:1 of https://codereview.chromium.org/758693002/)

Reason for revert:
Try again, for real.

Original issue's description:
> Blink hasn't rolled yet, better.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/89ff0846fd9dacf5f081373746624d450a5f8c26

TBR=mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/754303004
Rebaselines

This CL rebaselines:

Two GMs from https://codereview.chromium.org/748853002 (Add support for hoisting layers in pictures drawn with a matrix) which are only now showing up:

S4 Debug multipicturedraw_invpathclip_tiled_gpu
S4 Debug multipicturedraw_pathclip_tiled_gpu

Two GMs most likely from https://codereview.chromium.org/747043004 (Use scratch keys for stencil buffers):

Win8 Debug dashing2_nvprmsaa4
Win8 Debug glyph_pos_n_b_msaa16

Note that the dashing2 difference fixes an erroneously set pixel in the expected.

TBR=bsalomon@google.com, tomhudson@google.com

Review URL: https://codereview.chromium.org/758023003
Remove GrSurface::isSameAs

Review URL: https://codereview.chromium.org/753783003
Use text size on Mac.

The current code assumes that text on Mac is freely scalable,
or at least that the text size is just a part of the transform.
However, it appears that application of the 'trak' table,
as well as other optical adjustments, may rely on the text size
directly.

This change passes the text size requested directly to CoreText.

BUG=chromium:427528

Review URL: https://codereview.chromium.org/752183002
fix for the msvs gyp generator that produces nonposix path separators

BUG=skia:3139

Review URL: https://codereview.chromium.org/753313002