Revert of SkPDF: cache metrics once.

Revert of SkPDF:  cache metrics once. (patchset #4 id:60001 of https://codereview.chromium.org/2253993002/ )

Reason for revert:
because

Original issue's description:
> SkPDF:  cache metrics once.
> 
> Motivation: drawText can look up unicode mapping at draw time to see
> if ActualText should be used after crrev.com/2084533004 lands.
> 
> For each SkTypeface, only call getAdvancedTypefaceMetrics() once per
> document.  Cache the result in the SkPDFCanon, indexed by SkFontID.
> Also cache PDF FontDescriptors in the canon, also indexed by SkFontID
> (Type1 fonts only).
> 
> Simplify PDF font lookup, map SkFontID+SkGlyphID into a uint64_t.  Map
> that uint64_t to SkPDFFonts.  Remove SkPDFCanon::findFont(),
> SkPDFCanon::addFont(), SkPDFFont::IsMatch(), and enum SkPDFFont::Match.
> 
> SkPDFFont no longer holds on to ref of SkAdvancedTypefaceMetrics.
> Instead, SkPDFFont::GetFontResource() and SkPDFFont::getFontSubset()
> get metrics from canon.
> 
> SkPDFFont multybite bool is now a function of type.
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2253993002
> 
> Committed: https://skia.googlesource.com/skia/+/0a61270f4ba85d10659fb63a86817b435ec04c94

TBR=bungeman@google.com,halcanary@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://skia.googlesource.com/skia/+/671fec43e51533b9969502c072cd29d88ebef6ea

[robertphillips, 2016-08-17 23:28:17]

The CQ bit was checked by robertphillips@google.com

[robertphillips, 2016-08-17 23:28:17]

Created Revert of SkPDF:  cache metrics once.

[commit-bot: I haz the power, 2016-08-17 23:28:23]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-17 23:28:32]

Description was changed from

==========
Revert of SkPDF:  cache metrics once. (patchset #4 id:60001 of
https://codereview.chromium.org/2253993002/ )

Reason for revert:
because

Original issue's description:
> SkPDF:  cache metrics once.
> 
> Motivation: drawText can look up unicode mapping at draw time to see
> if ActualText should be used after crrev.com/2084533004 lands.
> 
> For each SkTypeface, only call getAdvancedTypefaceMetrics() once per
> document.  Cache the result in the SkPDFCanon, indexed by SkFontID.
> Also cache PDF FontDescriptors in the canon, also indexed by SkFontID
> (Type1 fonts only).
> 
> Simplify PDF font lookup, map SkFontID+SkGlyphID into a uint64_t.  Map
> that uint64_t to SkPDFFonts.  Remove SkPDFCanon::findFont(),
> SkPDFCanon::addFont(), SkPDFFont::IsMatch(), and enum SkPDFFont::Match.
> 
> SkPDFFont no longer holds on to ref of SkAdvancedTypefaceMetrics.
> Instead, SkPDFFont::GetFontResource() and SkPDFFont::getFontSubset()
> get metrics from canon.
> 
> SkPDFFont multybite bool is now a function of type.
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2253993002
> 
> Committed:
https://skia.googlesource.com/skia/+/0a61270f4ba85d10659fb63a86817b435ec04c94

TBR=bungeman@google.com,halcanary@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of SkPDF:  cache metrics once. (patchset #4 id:60001 of
https://codereview.chromium.org/2253993002/ )

Reason for revert:
because

Original issue's description:
> SkPDF:  cache metrics once.
> 
> Motivation: drawText can look up unicode mapping at draw time to see
> if ActualText should be used after crrev.com/2084533004 lands.
> 
> For each SkTypeface, only call getAdvancedTypefaceMetrics() once per
> document.  Cache the result in the SkPDFCanon, indexed by SkFontID.
> Also cache PDF FontDescriptors in the canon, also indexed by SkFontID
> (Type1 fonts only).
> 
> Simplify PDF font lookup, map SkFontID+SkGlyphID into a uint64_t.  Map
> that uint64_t to SkPDFFonts.  Remove SkPDFCanon::findFont(),
> SkPDFCanon::addFont(), SkPDFFont::IsMatch(), and enum SkPDFFont::Match.
> 
> SkPDFFont no longer holds on to ref of SkAdvancedTypefaceMetrics.
> Instead, SkPDFFont::GetFontResource() and SkPDFFont::getFontSubset()
> get metrics from canon.
> 
> SkPDFFont multybite bool is now a function of type.
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2253993002
> 
> Committed:
https://skia.googlesource.com/skia/+/0a61270f4ba85d10659fb63a86817b435ec04c94

TBR=bungeman@google.com,halcanary@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed:
https://skia.googlesource.com/skia/+/671fec43e51533b9969502c072cd29d88ebef6ea
==========

[commit-bot: I haz the power, 2016-08-17 23:28:32]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/671fec43e51533b9969502c072cd29d88ebef6ea