Revert of Revert of Run webgl_conformance with the Android WebView sh…

…ell (patchset chromium#1 id:1 of https://codereview.chromium.org/1119283005/)

Reason for revert:
Bot was upgraded to K. Let's give it another try.

Revert the Revert!

Original issue's description:
> Revert of Run webgl_conformance with the Android WebView shell (patchset chromium#1 id:1 of https://codereview.chromium.org/1126793005/)
>
> Reason for revert:
> Doesn't work on the bot. Works locally. No idea.
>
> Original issue's description:
> > Run webgl_conformance with the Android WebView shell
> >
> > This adds a build step to run conformance with the
> > webview shell, which exercises very different codepaths
> >
> > NOTRY=True (There are no trybots for this)
> >
> > BUG=420707
> > R=kbr@chromium.org, navabi@chromium.org, navabi@google.com
> >
> > Committed: https://chromium.googlesource.com/chromium/src/+/f3abeea37887a3e4fa22060c3683304bcc93c06b
>
> TBR=kbr@chromium.org,boliu@chromium.org,navabi@chromium.org,navabi@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=420707
>
> Committed: https://crrev.com/998503c5965b0d8d80674eac6250ced0af98c563
> Cr-Commit-Position: refs/heads/master@{#328409}

TBR=kbr@chromium.org,boliu@chromium.org,navabi@chromium.org,navabi@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=420707

Review URL: https://codereview.chromium.org/1121893003

Cr-Commit-Position: refs/heads/master@{#328425}

build/android/buildbot/bb_device_steps.py

@@ -537,6 +537,11 @@ def RunGPUTests(options):
           '--browser=android-content-shell', 'webgl_conformance',
           '--webgl-conformance-version=1.0.1'])
 
+  bb_annotations.PrintNamedStep('android_webview_webgl_conformance_tests')
+  RunCmd(['content/test/gpu/run_gpu_test.py',
+          '--browser=android-webview-shell', 'webgl_conformance',
+          '--webgl-conformance-version=1.0.1'])
+
   bb_annotations.PrintNamedStep('gpu_rasterization_tests')
   RunCmd(['content/test/gpu/run_gpu_test.py',
           'gpu_rasterization',