Check that uncompressed data passed to zlib is defined, and mark compression result as defined. This way, we suppress benign reports from zlib (see http://www.zlib.net/zlib_faq.html#faq36), without losing coverage of spdy code.
Check that uncompressed data passed to zlib is defined, and mark compression
result as defined. This way, we suppress benign reports from zlib (see
http://www.zlib.net/zlib_faq.html#faq36), without losing coverage of spdy code.

This patch was originally prepared by eugenis@chromium.org (doesn't have a committer
access yet) and reviewed at http://codereview.chromium.org/6591101/

TBR=wtc

Review URL: http://codereview.chromium.org/6286146

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77036 0039d316-1c4b-4281-b951-d872f2087c98

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