Make the Pepper 2D API paint on Mac. We just had to implement the code to copy from the SkBitmap backing store to the WebCanvas. I was hoping to share the code a bit better, but this case is subtly different from the other ones I found, and there is not actually that much code that would be saved by a shared implementation.
Make the Pepper 2D API paint on Mac. We just had to implement the code to copy
from the SkBitmap backing store to the WebCanvas. I was hoping to share the
code a bit better, but this case is subtly different from the other ones I
found, and there is not actually that much code that would be saved by a shared
implementation.

TEST=run the pepper test plugin and see the gradient circle
BUG=38893
Review URL: http://codereview.chromium.org/1445002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@42975 0039d316-1c4b-4281-b951-d872f2087c98

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vak/chromium.src,mohamed--abdel-maksoud/chromium.src,timopulkkinen/BubbleFish,fujunwei/chromium-crosswalk,Jonekee/chromium.src,littlstar/chromium.src,rogerwang/chromium,M4sse/chromium.src,jaruba/chromium.src,timopulkkinen/BubbleFish,patrickm/chromium.src,dednal/chromium.src,PeterWangIntel/chromium-crosswalk,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,littlstar/chromium.src,hujiajie/pa-chromium,junmin-zhu/chromium-rivertrail,TheTypoMaster/chromium-crosswalk,robclark/chromium,dushu1203/chromium.src,markYoungH/chromium.src,Fireblend/chromium-crosswalk,axinging/chromium-crosswalk,chuan9/chromium-crosswalk,Chilledheart/chromium,mogoweb/chromium-crosswalk,junmin-zhu/chromium-rivertrail,rogerwang/chromium,patrickm/chromium.src,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,ltilve/chromium,chuan9/chromium-crosswalk,hujiajie/pa-chromium,hgl888/chromium-crosswalk-efl,dednal/chromium.src,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,pozdnyakov/chromium-crosswalk,pozdnyakov/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk-efl,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,junmin-zhu/chromium-rivertrail,zcbenz/cefode-chromium,chuan9/chromium-crosswalk,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,rogerwang/chromium,rogerwang/chromium,zcbenz/cefode-chromium,nacl-webkit/chrome_deps,dushu1203/chromium.src,junmin-zhu/chromium-rivertrail,keishi/chromium,crosswalk-project/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,PeterWangIntel/chromium-crosswalk,ltilve/chromium,littlstar/chromium.src,ltilve/chromium,Pluto-tv/chromium-crosswalk,anirudhSK/chromium,markYoungH/chromium.src,jaruba/chromium.src,jaruba/chromium.src,pozdnyakov/chromium-crosswalk,Fireblend/chromium-crosswalk,axinging/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,patrickm/chromium.src,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,Jonekee/chromium.src,ChromiumWebApps/chromium,pozdnyakov/chromium-crosswalk,fujunwei/chromium-crosswalk,Chilledheart/chromium,hujiajie/pa-chromium,ondra-novak/chromium.src,keishi/chromium,nacl-webkit/chrome_deps,rogerwang/chromium,fujunwei/chromium-crosswalk,robclark/chromium,crosswalk-project/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,rogerwang/chromium,axinging/chromium-crosswalk,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,pozdnyakov/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,ltilve/chromium,keishi/chromium,pozdnyakov/chromium-crosswalk,pozdnyakov/chromium-crosswalk,hgl888/chromium-crosswalk-efl,keishi/chromium,mogoweb/chromium-crosswalk,Just-D/chromium-1,PeterWangIntel/chromium-crosswalk,bright-sparks/chromium-spacewalk,Pluto-tv/chromium-crosswalk,zcbenz/cefode-chromium,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,nacl-webkit/chrome_deps,rogerwang/chromium,anirudhSK/chromium,robclark/chromium,mogoweb/chromium-crosswalk,dednal/chromium.src,hgl888/chromium-crosswalk,mogoweb/chromium-crosswalk,keishi/chromium,axinging/chromium-crosswalk,Chilledheart/chromium,anirudhSK/chromium,TheTypoMaster/chromium-crosswalk,Fireblend/chromium-crosswalk,jaruba/chromium.src,Chilledheart/chromium,zcbenz/cefode-chromium,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,Jonekee/chromium.src,anirudhSK/chromium,hgl888/chromium-crosswalk-efl,axinging/chromium-crosswalk,pozdnyakov/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,hujiajie/pa-chromium,timopulkkinen/BubbleFish,mogoweb/chromium-crosswalk,dushu1203/chromium.src,nacl-webkit/chrome_deps,anirudhSK/chromium,robclark/chromium,junmin-zhu/chromium-rivertrail,patrickm/chromium.src,dednal/chromium.src,ondra-novak/chromium.src,hujiajie/pa-chromium,littlstar/chromium.src,anirudhSK/chromium,littlstar/chromium.src,dushu1203/chromium.src,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,ondra-novak/chromium.src,mogoweb/chromium-crosswalk,axinging/chromium-crosswalk,ondra-novak/chromium.src,nacl-webkit/chrome_deps,markYoungH/chromium.src,dednal/chromium.src,Fireblend/chromium-crosswalk,rogerwang/chromium,Pluto-tv/chromium-crosswalk,markYoungH/chromium.src,rogerwang/chromium