Revert of Merge tomhudson and mtklein SkPaint shrinking approaches.

Revert of Merge tomhudson and mtklein SkPaint shrinking approaches. (https://codereview.chromium.org/158913005/)

Reason for revert:
Breaking the build - see https://code.google.com/p/skia/issues/detail?id=2190

Original issue's description:
> Merge tomhudson and mtklein SkPaint shrinking approaches.
> 
> I think this is cherry picking the best parts of both our CLs.  We've got dirty bit tracking from Tom's, picture format stability from Mike's, etc.  Paints are typically 1/3 their original size when flattened in the dictionary.
> 
> bench_record on my desktop looks promising.  Generally, looks faster.  (Best in monospace.)
> a/b   skp                               before  after
> 0.83  desk_techcrunch.skp               0.29    0.24
> 0.83  tabl_gamedeksiam.skp              0.52    0.43
> 0.87  desk_carsvg.skp                   0.4     0.35
> 0.87  desk_googlehome.skp               0.038   0.033
> 0.87  desk_pokemonwiki.skp              3.9     3.4
> 0.88  desk_fontwipe.skp                 0.0089  0.0078
> 0.88  desk_googlespreadsheet.skp        0.16    0.14
> 0.89  desk_jsfiddlebigcar.skp           0.027   0.024
> 0.89  desk_tigersvg.skp                 0.038   0.034
> 0.89  desk_weather.skp                  0.19    0.17
> 0.89  tabl_engadget.skp                 0.37    0.33
> 0.89  tabl_googleblog.skp               0.28    0.25
> 0.9   desk_facebook.skp                 0.2     0.18
> 0.91  desk_mapsvg.skp                   0.45    0.41
> 0.91  desk_youtube.skp                  0.22    0.2
> 0.92  desk_forecastio.skp               0.12    0.11
> 0.92  desk_googlespreadsheetdashed.skp  0.49    0.45
> 0.92  desk_gws.skp                      0.13    0.12
> 0.92  desk_pinterest.skp                0.037   0.034
> 0.92  desk_twitter.skp                  0.25    0.23
> 0.92  tabl_culturalsolutions.skp        0.26    0.24
> 0.92  tabl_gspro.skp                    0.072   0.066
> 0.92  tabl_mercurynews.skp              0.26    0.24
> 0.93  desk_booking.skp                  0.46    0.43
> 0.93  desk_chalkboard.skp               0.28    0.26
> 0.93  desk_linkedin.skp                 0.14    0.13
> 0.93  desk_mobilenews.skp               0.28    0.26
> 0.93  tabl_cuteoverload.skp             0.46    0.43
> 0.93  tabl_deviantart.skp               0.15    0.14
> 0.93  tabl_gmail.skp                    0.029   0.027
> 0.93  tabl_googlecalendar.skp           0.15    0.14
> 0.93  tabl_mlb.skp                      0.15    0.14
> 0.94  desk_blogger.skp                  0.18    0.17
> 0.94  desk_jsfiddlehumperclip.skp       0.034   0.032
> 0.94  desk_wordpress.skp                0.33    0.31
> 0.94  desk_wowwiki.skp                  0.94    0.88
> 0.94  desk_yahooanswers.skp             0.17    0.16
> 0.94  desk_youtubetvvideo.skp           0.017   0.016
> 0.94  tabl_sahadan.skp                  0.093   0.087
> 0.94  tabl_worldjournal.skp             0.35    0.33
> 0.95  desk_css3gradients.skp            0.21    0.2
> 0.95  desk_gmailthread.skp              0.19    0.18
> 0.95  tabl_cnet.skp                     0.42    0.4
> 0.95  tabl_mozilla.skp                  1.9     1.8
> 0.95  tabl_pravda.skp                   0.19    0.18
> 0.96  mobi_wikipedia.skp                0.55    0.53
> 0.96  tabl_cnn.skp                      0.48    0.46
> 0.96  tabl_nofolo.skp                   0.05    0.048
> 0.97  desk_googleplus.skp               0.29    0.28
> 0.97  tabl_frantzen.skp                 0.059   0.057
> 0.97  tabl_onlinewsj.skp                0.38    0.37
> 0.97  tabl_slashdot.skp                 0.1     0.097
> 0.97  tabl_vnexpress.skp                0.29    0.28
> 0.99  desk_amazon.skp                   0.088   0.087
> 1     desk_baidu.skp                    0.097   0.099
> 1     desk_ebay.skp                     0.18    0.18
> 1     desk_espn.skp                     0.24    0.24
> 1     desk_oldinboxapp.skp              0.026   0.026
> 1     desk_rectangletransition.skp      0.014   0.014
> 1     desk_samoasvg.skp                 0.23    0.24
> 1     desk_yahoogames.skp               0.029   0.029
> 1     desk_yahoosports.skp              0.0033  0.0033
> 1     desk_youtubetvbrowse.skp          0.01    0.01
> 1     tabl_androidpolice.skp            0.65    0.65
> 1     tabl_digg.skp                     0.33    0.33
> 1     tabl_hsfi.skp                     0.32    0.32
> 1     tabl_nytimes.skp                  0.22    0.22
> 1     tabl_techmeme.skp                 0.069   0.072
> 1     tabl_ukwsj.skp                    0.35    0.35
> 1.1   desk_sfgate.skp                   0.25    0.28
> 
> 
> BUG=skia:
> 
> Committed: http://code.google.com/p/skia/source/detail?r=13487

TBR=tomhudson@google.com,reed@google.com,mtklein@google.com,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=13491

[scroggo, 2014-02-18 18:40:55]

Created Revert of Merge tomhudson and mtklein SkPaint shrinking approaches.

[commit-bot: I haz the power, 2014-02-18 18:41:02]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/scroggo@google.com/169183003/1

[commit-bot: I haz the power, 2014-02-18 18:41:23]

Change committed as 13491