The GPU process doesn't start on this bot:
https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28Intel%29?numbuilds=200

with --use-angle=gl. Here's a log excerpt.

Skipping this step entirely on this bot for the moment.

3112 2016-03-01 00:57:01.750 I: Profiling: Section Setup took 1.779 seconds
3112 2016-03-01 00:57:04.194 I: Profiling: Section GetIsolateds took 2.442 seconds
3112 2016-03-01 00:57:04.423 I: Retrieving remaining files (0 of them)...
3112 2016-03-01 00:57:14.336 I: Profiling: Section GetRest took 10.141 seconds
3112 2016-03-01 00:57:14.417 I:     0 (       0kb) added
3112 2016-03-01 00:57:14.423 I: 13382 ( 7184423kb) current
3112 2016-03-01 00:57:14.423 I:     0 (       0kb) removed
3112 2016-03-01 00:57:14.423 I:        378426168kb free
3112 2016-03-01 00:57:14.423 I: Profiling: Section CleanupTrimming took 0.086 seconds
3112 2016-03-01 00:57:15.944 I: run_command(['C:\\b\\depot_tools\\python276_bin\\python.exe', u'..\\testing\\scripts\\run_telemetry_benchmark_as_googletest.py', u'../content/test/gpu/run_gpu_test.py', 'webgl_conformance', '--show-stdout', '--browser=release', '-v', '--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc --use-angle=gl', '--isolated-script-test-output', 'c:\\users\\chrome~1\\appdata\\local\\temp\\tmpavvy6y.json'], c:\users\chrome~1\appdata\local\temp\isolated_run30zuv4\chrome)
(WARNING) 2016-02-29 16:57:17,428 desktop_browser_finder.FindAllAvailableBrowsers:147  Chrome build location is not specified. Browser will be run without Flash.
(INFO) 2016-02-29 16:57:17,430 browser_finder.FindBrowser:122  Chose browser: PossibleDesktopBrowser(type=release, executable=c:\users\chrome~1\appdata\local\temp\isolated_run30zuv4\out\Release\chrome.exe, flash=None)
(WARNING) 2016-02-29 16:57:17,466 desktop_browser_finder.FindAllAvailableBrowsers:147  Chrome build location is not specified. Browser will be run without Flash.
(INFO) 2016-02-29 16:57:17,467 browser_finder.FindBrowser:122  Chose browser: PossibleDesktopBrowser(type=release, executable=c:\users\chrome~1\appdata\local\temp\isolated_run30zuv4\out\Release\chrome.exe, flash=None)
[ RUN      ] WebglConformance.conformance_attribs_gl_bindAttribLocation_aliasing
(INFO) 2016-02-29 16:57:17,467 desktop_browser_backend.GetBrowserStartupArgs:272  Requested remote debugging port: 0
(INFO) 2016-02-29 16:57:17,497 desktop_browser_backend.Start:306  Starting Chrome ['c:\\users\\chrome~1\\appdata\\local\\temp\\isolated_run30zuv4\\out\\Release\\chrome.exe', '--use-angle=gl', '--disable-domain-blocking-for-3d-apis', '--disable-gesture-requirement-for-media-playback', '--disable-gpu-process-crash-limit', '--test-type=gpu', '--enable-experimental-canvas-features', '--js-flags=--expose-gc', '--enable-logging=stderr', '--enable-net-benchmarking', '--metrics-recording-only', '--no-default-browser-check', '--no-first-run', '--enable-gpu-benchmarking', '--disable-background-networking', '--user-agent=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2194.2 Safari/537.36', '--no-proxy-server', '--disable-component-extensions-with-background-pages', '--disable-default-apps', '--remote-debugging-port=0', '--enable-crash-reporter-for-testing', '--window-size=1280,1024', '--user-data-dir=c:\\users\\chrome~1\\appdata\\local\\temp\\isolated_tmpenlkxi\\tmppjsivu', 'about:blank']
(INFO) 2016-02-29 16:57:17,707 desktop_browser_backend.HasBrowserFinishedLaunching:259  Discovered ephemeral port 52907
(INFO) 2016-02-29 16:57:17,831 shared_page_state._StartBrowser:198  OS: win win7
[3292:2328:0229/165722:ERROR:system_info_handler.cc(235)] SystemInfoHandler: request for GPU info timed out! Most recent info sent.
[3232:456:0229/165727:ERROR:angle_platform_impl.cc(33)] ANGLE Display::initialize error 0: Failed to open D3D device.
[3232:456:0229/165727:ERROR:gl_surface_egl.cc(586)] eglInitialize OpenGL failed with error EGL_BAD_PARAMETER
[3232:456:0229/165727:ERROR:angle_platform_impl.cc(33)] ANGLE Display::initialize error 0: Failed to open D3D device.
[3232:456:0229/165727:ERROR:gl_surface_egl.cc(586)] eglInitialize OpenGL failed with error EGL_BAD_PARAMETER
[3232:456:0229/165727:ERROR:gl_surface_win.cc(69)] GLSurfaceEGL::InitializeOneOff failed.
[3232:456:0229/165727:ERROR:gpu_child_thread.cc(364)] Exiting GPU process due to errors during initialization
[0229/165727:ERROR:main_dll_loader_win.cc(197)] Could not find exported function RelaunchChromeBrowserWithNewCommandLineIfNeeded