The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e

commit 5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e
Author: acondor <acondor@google.com>
Date: Wed May 31 16:23:04 2017

VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG= 728146 
# Presubmit doesn't like float casts in the shader code, which it thinks is c++ when it isn't.
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Commit-Position: refs/heads/master@{#475935}

[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/ui_elements/ui_element.h
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/ui_scene_manager.cc
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/ui_scene_manager.h
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/vr_shell_renderer.cc
[modify] https://crrev.com/5d5052f3e33d06bf1f6710a8e1a94fd972e9c83e/chrome/browser/android/vr_shell/vr_shell_renderer.h

Your change meets the bar and is auto-approved for M60. Please go ahead and merge the CL to branch 3112 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

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

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2cf486993e67211dd0a470bd86f4c3eec1234df4

commit 2cf486993e67211dd0a470bd86f4c3eec1234df4
Author: acondor <acondor@google.com>
Date: Thu Jun 01 18:07:10 2017

VR: Soften the floor grid

- The grid is now drawn in the fragment shader instead of calling DrawLines.
- A single quad is used for the floor, mixing the background and the grid itself in a single shader.
- The geometry simplifies from a set of lines to a single quad.
- The precision for gradient shaders was set to low to reduce stress in the GPU.

BUG= 728146 
 Presubmit doesn't like float casts in the shader code, which it thinks is c++ when it isn't.
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2907203002
Cr-Original-Commit-Position: refs/heads/master@{#475935}
Review-Url: https://codereview.chromium.org/2915143002
Cr-Commit-Position: refs/branch-heads/3112@{#98}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/ui_elements/ui_element.h
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/ui_scene_manager.cc
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/ui_scene_manager.h
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/vr_shell_renderer.cc
[modify] https://crrev.com/2cf486993e67211dd0a470bd86f4c3eec1234df4/chrome/browser/android/vr_shell/vr_shell_renderer.h