Srcover for sprite blitters.
Srcover for sprite blitters.

In order for this code to run, the gDefaultProfileIsSRGB flag needs to be true.

min base     min exp    percent   name
5601856   4689911   0.837207  top25desk_espn.skp_1
3491515   3202806   0.917311  top25desk_facebook.skp_1
5110247   4865740   0.952154  top25desk_weather_com.skp_1
605445    585520    0.96709   top25desk_techcrunch_com.skp_1
1007151   986193    0.979191  top25desk_wikipedia__1_tab_.skp_1
5951286   5889979   0.989699  top25desk_sports_yahoo_com_.skp_1
2825583   2804853   0.992663  top25desk_plus_google_com_11003.skp_1
8839265   8823249   0.998188  top25desk_twitter.skp_1
4169125   4168882   0.999942  top25desk_docs___1_open_documen.skp_1
6615327   6620663   1.00081   top25desk_youtube_com.skp_1
4613903   4647583   1.0073    top25desk_wordpress.skp_1
2532280   2554154   1.00864   top25desk_ebay_com.skp_1
4015689   4063584   1.01193   top25desk_google_com__hl_en_q_b.skp_1
9427478   9579203   1.01609   top25desk_answers_yahoo_com.skp_1
7403901   7542770   1.01876   top25desk_booking_com.skp_1
12249953  12528353  1.02273   top25desk_google_com_search_q_c.skp_1
1078648   1111050   1.03004   top25desk_games_yahoo_com.skp_1
7232627   7481555   1.03442   top25desk_pinterest.skp_1
2996819   3112091   1.03846   top25desk_google_com_calendar_.skp_1
2181531   2271677   1.04132   top25desk_amazon_com.skp_1
925245    987545    1.06733   top25desk_blogger.skp_1
4143359   4442607   1.07222   top25desk_linkedin.skp_1
4370962   4744580   1.08548   top25desk_news_yahoo_com.skp_1
4284025   4735094   1.10529   top25desk_mail_google_com_mail_.skp_1

[mtklein] We measured the noise here to be [-5%, +8%], so most of these changes fall within the noise.  We manually confirmed the two above that noise window (yahoo and mail) are also noise... srcover_srgb_srgb() did not figure prominently in their profiles.  The espn and facebook improvements look real.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1996683003

Review-Url: https://codereview.chromium.org/1996683003

aosp-mirror/platform_external_skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,google/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,HalCanary/skia-hc,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,rubenvb/skia,aosp-mirror/platform_external_skia,google/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc