Revert of Telemetry: Use the leftmost argument to find the test to parse flags. (patchset #2 id:20001 of https://codereview.chromium.org/582793002/)
Revert of Telemetry: Use the leftmost argument to find the test to parse flags. (patchset #2 id:20001 of https://codereview.chromium.org/582793002/)

Reason for revert:
Broke Android debug gpu bot:
http://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%207%29/builds/12692

This bot relies on being able to supply some flags before the test name; it runs:
content/test/gpu/run_gpu_test.py --browser=android-content-shell webgl_conformance --webgl-conformance-version=1.0.1

Original issue's description:
> Telemetry: Use the leftmost argument to find the test to parse flags.
>
> Previously it would check all of the arguments, and use the last test found.
> This is causes problems as different tests can be used to create the parser and
> accepts the parsed flags.
>
> SHERIFFS: If errors related to parsing flags for run_measurement, run_benchmark
> or run_gpu_test.py appear, this is likely the cause. It is safe to revert.
>
> BUG=413334
>
> Committed: https://crrev.com/5afe5a61f03743bd523dae66f662ad773f8befb9
> Cr-Commit-Position: refs/heads/master@{#295738}

TBR=nednguyen@google.com,kbr@chromium.org,tonyg@chromium.org,dtu@chromium.org,ariblue@google.com
NOTREECHECKS=true
NOTRY=true
BUG=413334

Review URL: https://codereview.chromium.org/584023003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#295765}

PeterWangIntel/chromium-crosswalk,fujunwei/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,krieger-od/nwjs_chromium.src,fujunwei/chromium-crosswalk,dednal/chromium.src,Just-D/chromium-1,fujunwei/chromium-crosswalk,jaruba/chromium.src,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,chuan9/chromium-crosswalk,axinging/chromium-crosswalk,dushu1203/chromium.src,Jonekee/chromium.src,Chilledheart/chromium,hgl888/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,fujunwei/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,axinging/chromium-crosswalk,Chilledheart/chromium,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,hgl888/chromium-crosswalk-efl,Fireblend/chromium-crosswalk,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,chuan9/chromium-crosswalk,ltilve/chromium,Chilledheart/chromium,chuan9/chromium-crosswalk,Pluto-tv/chromium-crosswalk,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,Just-D/chromium-1,ltilve/chromium,Jonekee/chromium.src,Chilledheart/chromium,crosswalk-project/chromium-crosswalk-efl,ltilve/chromium,jaruba/chromium.src,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,jaruba/chromium.src,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk,Jonekee/chromium.src,fujunwei/chromium-crosswalk,fujunwei/chromium-crosswalk,Just-D/chromium-1,markYoungH/chromium.src,Pluto-tv/chromium-crosswalk,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,dushu1203/chromium.src,krieger-od/nwjs_chromium.src,markYoungH/chromium.src,TheTypoMaster/chromium-crosswalk,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,dushu1203/chromium.src,M4sse/chromium.src,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,dednal/chromium.src,M4sse/chromium.src,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,Just-D/chromium-1,fujunwei/chromium-crosswalk,Just-D/chromium-1,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,ltilve/chromium,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,chuan9/chromium-crosswalk,Just-D/chromium-1,krieger-od/nwjs_chromium.src,markYoungH/chromium.src,ltilve/chromium,hgl888/chromium-crosswalk-efl,markYoungH/chromium.src,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,M4sse/chromium.src,Chilledheart/chromium,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,M4sse/chromium.src,dushu1203/chromium.src,axinging/chromium-crosswalk,dednal/chromium.src,Chilledheart/chromium,axinging/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,Just-D/chromium-1,Chilledheart/chromium,axinging/chromium-crosswalk,hgl888/chromium-crosswalk-efl,dednal/chromium.src,Pluto-tv/chromium-crosswalk,markYoungH/chromium.src,M4sse/chromium.src,fujunwei/chromium-crosswalk,Pluto-tv/chromium-crosswalk,M4sse/chromium.src,Jonekee/chromium.src,jaruba/chromium.src,M4sse/chromium.src,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,Fireblend/chromium-crosswalk,ltilve/chromium,markYoungH/chromium.src,markYoungH/chromium.src,hgl888/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,dushu1203/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,TheTypoMaster/chromium-crosswalk,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk,Just-D/chromium-1,Fireblend/chromium-crosswalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,dushu1203/chromium.src,ltilve/chromium,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,markYoungH/chromium.src,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,Jonekee/chromium.src,markYoungH/chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,Fireblend/chromium-crosswalk,Jonekee/chromium.src,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,dednal/chromium.src,dednal/chromium.src,axinging/chromium-crosswalk,dushu1203/chromium.src,fujunwei/chromium-crosswalk,dednal/chromium.src,ltilve/chromium,dushu1203/chromium.src,Jonekee/chromium.src,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,Chilledheart/chromium,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,Jonekee/chromium.src,jaruba/chromium.src,ltilve/chromium,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk