Use histogram_bits to initalize transform_bits.
Use histogram_bits to initalize transform_bits.

This change gains back 1% in compression density for method=3 and 0.5% for
method=4, at the expense of 10% slower compression speed.

Change-Id: I491aa1c726def934161d4a4377e009737fbeff82

zofuthan/libwebp,altogother/webm.libwebp,PKRoma/libwebp,Maria1099/webm.libwebp,ttyangf/libwebp,imazen/libwebp,jacklicn/libwebp,altogother/webm.libwebp,iniwf/webm.libwebp,keane83/BLE_IM,Suvarna1488/webm.libwebp,iniwf/webm.libwebp,comoyo/gonzo-libwebp,zofuthan/libwebp,Maria1099/webm.libwebp,zofuthan/libwebp,rxl194/libwebp,reimaginemedia/webm.libwebp,imazen/libwebp,imazen/libwebp,Aexyn/libwebp,Suvarna1488/webm.libwebp,kim42083/webm.libwebp,webmproject/libwebp,altogother/webm.libwebp,ericmckean/webm.libwebp,zofuthan/libwebp,kalli123/webm.libwebp,imazen/libwebp,abwiz0086/webm.libwebp,matanbs/webm.libwebp,yohunl/libwebp,redengineer/libwebp,gshORTON/webm.libwebp,Acidburn0zzz/webm.libwebp,redengineer/libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,kleopatra999/webm.libwebp,webmproject/libwebp,rxl194/libwebp,jiehu5114/libwebp,PKRoma/libwebp,yohunl/libwebp,jacklicn/libwebp,iniwf/webm.libwebp,ya7lelkom/libwebp,jacklicn/libwebp,PKRoma/libwebp,appunite/libwebp,kalli123/webm.libwebp,appunite/libwebp,yohunl/libwebp,gshORTON/webm.libwebp,PKRoma/libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,kleopatra999/webm.libwebp,matanbs/webm.libwebp,Acidburn0zzz/webm.libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,ericmckean/webm.libwebp,ttyangf/libwebp,appunite/libwebp,jiehu5114/libwebp,rxl194/libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,ttyangf/libwebp,appunite/libwebp,Acidburn0zzz/webm.libwebp,webmproject/libwebp,abwiz0086/webm.libwebp,redengineer/libwebp,Acidburn0zzz/webm.libwebp,yohunl/libwebp,Suvarna1488/webm.libwebp,keane83/BLE_IM,jiehu5114/libwebp,jiehu5114/libwebp,redengineer/libwebp,keane83/BLE_IM,rxl194/libwebp,Suvarna1488/webm.libwebp,kim42083/webm.libwebp,abwiz0086/webm.libwebp,iniwf/webm.libwebp,yohunl/libwebp,matanbs/webm.libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,matanbs/webm.libwebp,gshORTON/webm.libwebp,reimaginemedia/webm.libwebp,imazen/libwebp,PKRoma/libwebp,ericmckean/webm.libwebp,kim42083/webm.libwebp,comoyo/gonzo-libwebp,appunite/libwebp,Maria1099/webm.libwebp,ya7lelkom/libwebp,kalli123/webm.libwebp,redengineer/libwebp,matanbs/webm.libwebp,ttyangf/libwebp,appunite/libwebp,Aexyn/libwebp,ya7lelkom/libwebp,comoyo/gonzo-libwebp,Maria1099/webm.libwebp,jacklicn/libwebp,keane83/BLE_IM,Suvarna1488/webm.libwebp,abwiz0086/webm.libwebp,webmproject/libwebp,rxl194/libwebp,ericmckean/webm.libwebp,ericmckean/webm.libwebp,PKRoma/libwebp,Acidburn0zzz/webm.libwebp,kalli123/webm.libwebp,Maria1099/webm.libwebp,altogother/webm.libwebp,reimaginemedia/webm.libwebp,zofuthan/libwebp,kalli123/webm.libwebp,jiehu5114/libwebp,keane83/BLE_IM,jacklicn/libwebp,ttyangf/libwebp,comoyo/gonzo-libwebp,Aexyn/libwebp,webmproject/libwebp,Aexyn/libwebp,kleopatra999/webm.libwebp,kim42083/webm.libwebp,ya7lelkom/libwebp,ya7lelkom/libwebp,altogother/webm.libwebp,kleopatra999/webm.libwebp,kleopatra999/webm.libwebp,reimaginemedia/webm.libwebp