Clarify what DM means in the README file.
Clarify what DM means in the README file.

It took me a while to figure out what this acronym meant. ;)
Googling for it lead me to gyp/dm.gyp.

BUG=None
TEST=None
R=mtklein@google.com

Review URL: https://codereview.chromium.org/638083003

invisiblek/android_external_skia,qrealka/skia-hc,pcwalton/skia,todotodoo/skia,chenlian2015/skia_from_google,TeamTwisted/external_skia,aosp-mirror/platform_external_skia,Igalia/skia,ominux/skia,geekboxzone/mmallow_external_skia,Infinitive-OS/platform_external_skia,boulzordev/android_external_skia,MonkeyZZZZ/platform_external_skia,TeamTwisted/external_skia,nvoron23/skia,shahrzadmn/skia,nfxosp/platform_external_skia,Igalia/skia,PAC-ROM/android_external_skia,ominux/skia,MonkeyZZZZ/platform_external_skia,chenlian2015/skia_from_google,shahrzadmn/skia,HalCanary/skia-hc,TeamTwisted/external_skia,VRToxin-AOSP/android_external_skia,ominux/skia,jtg-gg/skia,TeamExodus/external_skia,MonkeyZZZZ/platform_external_skia,jtg-gg/skia,scroggo/skia,invisiblek/android_external_skia,pcwalton/skia,w3nd1go/android_external_skia,samuelig/skia,boulzordev/android_external_skia,AOSP-YU/platform_external_skia,BrokenROM/external_skia,boulzordev/android_external_skia,Infinitive-OS/platform_external_skia,Jichao/skia,AOSP-YU/platform_external_skia,nfxosp/platform_external_skia,boulzordev/android_external_skia,DiamondLovesYou/skia-sys,AOSPB/external_skia,UBERMALLOW/external_skia,HalCanary/skia-hc,OneRom/external_skia,nfxosp/platform_external_skia,aosp-mirror/platform_external_skia,boulzordev/android_external_skia,spezi77/android_external_skia,Infinitive-OS/platform_external_skia,MinimalOS-AOSP/platform_external_skia,qrealka/skia-hc,rubenvb/skia,invisiblek/android_external_skia,samuelig/skia,geekboxzone/mmallow_external_skia,vanish87/skia,scroggo/skia,w3nd1go/android_external_skia,todotodoo/skia,BrokenROM/external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,rubenvb/skia,VRToxin-AOSP/android_external_skia,vanish87/skia,google/skia,YUPlayGodDev/platform_external_skia,TeamExodus/external_skia,noselhq/skia,scroggo/skia,aosp-mirror/platform_external_skia,invisiblek/android_external_skia,aosp-mirror/platform_external_skia,Infinitive-OS/platform_external_skia,vanish87/skia,samuelig/skia,invisiblek/android_external_skia,scroggo/skia,MinimalOS-AOSP/platform_external_skia,YUPlayGodDev/platform_external_skia,nfxosp/platform_external_skia,jtg-gg/skia,spezi77/android_external_skia,todotodoo/skia,Igalia/skia,TeamTwisted/external_skia,amyvmiwei/skia,nvoron23/skia,boulzordev/android_external_skia,Infinitive-OS/platform_external_skia,aosp-mirror/platform_external_skia,shahrzadmn/skia,PAC-ROM/android_external_skia,rubenvb/skia,nvoron23/skia,MonkeyZZZZ/platform_external_skia,timduru/platform-external-skia,jtg-gg/skia,qrealka/skia-hc,samuelig/skia,Jichao/skia,jtg-gg/skia,ominux/skia,spezi77/android_external_skia,qrealka/skia-hc,AOSP-YU/platform_external_skia,OneRom/external_skia,Infinitive-OS/platform_external_skia,amyvmiwei/skia,samuelig/skia,nfxosp/platform_external_skia,w3nd1go/android_external_skia,jtg-gg/skia,rubenvb/skia,BrokenROM/external_skia,BrokenROM/external_skia,w3nd1go/android_external_skia,amyvmiwei/skia,HalCanary/skia-hc,google/skia,AOSPB/external_skia,aosp-mirror/platform_external_skia,TeamExodus/external_skia,pcwalton/skia,invisiblek/android_external_skia,pcwalton/skia,samuelig/skia,qrealka/skia-hc,AOSPB/external_skia,shahrzadmn/skia,boulzordev/android_external_skia,YUPlayGodDev/platform_external_skia,DiamondLovesYou/skia-sys,UBERMALLOW/external_skia,Infinitive-OS/platform_external_skia,samuelig/skia,rubenvb/skia,VRToxin-AOSP/android_external_skia,MarshedOut/android_external_skia,nvoron23/skia,timduru/platform-external-skia,VRToxin-AOSP/android_external_skia,invisiblek/android_external_skia,MonkeyZZZZ/platform_external_skia,nvoron23/skia,TeamExodus/external_skia,nfxosp/platform_external_skia,OneRom/external_skia,todotodoo/skia,geekboxzone/mmallow_external_skia,noselhq/skia,Igalia/skia,todotodoo/skia,pcwalton/skia,YUPlayGodDev/platform_external_skia,MarshedOut/android_external_skia,todotodoo/skia,MarshedOut/android_external_skia,VRToxin-AOSP/android_external_skia,shahrzadmn/skia,TeamTwisted/external_skia,Infinitive-OS/platform_external_skia,AOSPB/external_skia,AOSPB/external_skia,BrokenROM/external_skia,AOSP-YU/platform_external_skia,amyvmiwei/skia,w3nd1go/android_external_skia,PAC-ROM/android_external_skia,BrokenROM/external_skia,AOSPB/external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,OneRom/external_skia,Igalia/skia,geekboxzone/mmallow_external_skia,google/skia,MonkeyZZZZ/platform_external_skia,noselhq/skia,PAC-ROM/android_external_skia,HalCanary/skia-hc,TeamExodus/external_skia,Jichao/skia,shahrzadmn/skia,shahrzadmn/skia,TeamExodus/external_skia,vanish87/skia,timduru/platform-external-skia,amyvmiwei/skia,MarshedOut/android_external_skia,nvoron23/skia,HalCanary/skia-hc,w3nd1go/android_external_skia,BrokenROM/external_skia,tmpvar/skia.cc,Jichao/skia,Hikari-no-Tenshi/android_external_skia,OneRom/external_skia,MarshedOut/android_external_skia,PAC-ROM/android_external_skia,timduru/platform-external-skia,YUPlayGodDev/platform_external_skia,chenlian2015/skia_from_google,Jichao/skia,UBERMALLOW/external_skia,r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