I just noticed the splash screen go by so fast the "Running in Chrome" message didn't even appear. Or it was delayed. I just saw a black screen before the presentation started. Chrome 65.0.3322.0.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1

commit 7fc0c9593c072895c1c01d63c890d5af4d6d2cb1
Author: Yash Malik <ymalik@google.com>
Date: Tue Jan 23 18:01:32 2018

VR: Show splash screen for a minimum duration

Before this CL, we would hide the splash screen as soon as we got the first
frame WebVR frame. Although TransientElement had a notion of "minimum duration",
it didn't really work because we stop drawing non-overalay 2D elements in
WebVR mode.

This CL fixes this by pausing WebVR VSyncs until the minimum duration for the
splash screen is passed.

Bug:  801639 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: If2580a97e714a17de5445fba85ab0aa6b487964b
Reviewed-on: https://chromium-review.googlesource.com/879268
Commit-Queue: Yash Malik <ymalik@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531275}
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/elements/transient_element.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/elements/transient_element.h
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/elements/transient_element_unittest.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/model/web_vr_model.h
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/testapp/vr_test_context.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/ui.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/ui.h
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/ui_scene_creator.cc
[modify] https://crrev.com/7fc0c9593c072895c1c01d63c890d5af4d6d2cb1/chrome/browser/vr/ui_unittest.cc

Your change meets the bar and is auto-approved for M65. Please go ahead and merge the CL to branch 3325 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), bhthompson@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

verified this fix in 66.0.3331.0

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd

commit b46fa9c1be579ee49f88071b15ed7bc00f5b85cd
Author: Yash Malik <ymalik@google.com>
Date: Fri Jan 26 00:54:08 2018

VR: Show splash screen for a minimum duration

Before this CL, we would hide the splash screen as soon as we got the first
frame WebVR frame. Although TransientElement had a notion of "minimum duration",
it didn't really work because we stop drawing non-overalay 2D elements in
WebVR mode.

This CL fixes this by pausing WebVR VSyncs until the minimum duration for the
splash screen is passed.

TBR=ymalik@google.com

(cherry picked from commit 7fc0c9593c072895c1c01d63c890d5af4d6d2cb1)

Bug:  801639 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: If2580a97e714a17de5445fba85ab0aa6b487964b
Reviewed-on: https://chromium-review.googlesource.com/879268
Commit-Queue: Yash Malik <ymalik@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#531275}
Reviewed-on: https://chromium-review.googlesource.com/887804
Reviewed-by: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#103}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/elements/transient_element.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/elements/transient_element.h
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/elements/transient_element_unittest.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/model/web_vr_model.h
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/testapp/vr_test_context.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/ui.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/ui.h
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/ui_scene_creator.cc
[modify] https://crrev.com/b46fa9c1be579ee49f88071b15ed7bc00f5b85cd/chrome/browser/vr/ui_unittest.cc