@wanming.lin -- The given url in comment #0 is opened as blank page . Attached screenshot for reference.

Could you please check the URL and provide us the correct url , that may help in triaging the issue better.

Thanks!

@hdodda, The url is correct, please check the console log to capture reading data.

Steps to reproduce the problem:
Test Case: https://generic-sensors.appspot.com/
Test Device: Dell Inspiron 13 7000 Series
Test Steps:
1. Click the button at the top right corner
2. A popup shows, and choose the "Groscope" Sensor type, click "ADD" button
3. Turn on the switch button

I found the state of groscope sensor is "activated", but no any value display on the screen(please refer to attachment "Windows 10.jpg"). It is work fine on Linux OS(refer to the "Linux.jpg").

Deleted: Windows10.jpg 150 KB

	Windows10.jpg 150 KB View Download

Deleted: Linux.jpg 134 KB

	Linux.jpg 134 KB View Download

Besides, I run the test case on Windows 8.1 (HP EliteBook Revolve 810).
The state of Ambient light and Gyroscope sensor is "activated".
The value of timeStamp and x,y,z does not show on the screen.(refer to the comment Windows 8.1.jpg)

Deleted: Windows 8.1.jpg 104 KB

	Windows 8.1.jpg 104 KB View Download

Thank you for providing more feedback. Adding requester "hdodda@chromium.org" for another review and adding "Needs-Review" label for tracking.

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

@wanming.lin I checked the test and there is a bug in it. Basically, sensor object goes out of scope and GC'ed. You can try rewriting the test by binding sensor object to a onchange function, then I think it would be fine.

@alexander.shalamov, but the issue is still existed, see #5. 

@wanming.lin, #5 shows that sensor is successfully activated, but sensor reading is not yet available. On Windows platform, sensors will deliver new readings whenever there is a change. If you pick up laptop and rotate it, you will see that new readings are available.

hi, @alexander.shalamov, the problem is that there's no new readings event if I rotate the devices(HP EliteBook Revolve 810 and ThinkPad UltraBook S1 Yoga), I am not sure if the problem is from my devices or the API implementation. But I am sure that my devices support the Ambient Light and Gyroscope sensor and there's no "NotFoundError" thrown.  

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/988f519584a682a2191c6ca72f91380f91d8166a

commit 988f519584a682a2191c6ca72f91380f91d8166a
Author: alexander.shalamov <alexander.shalamov@intel.com>
Date: Wed Jan 25 07:25:31 2017

[sensors][win] Use angular velocity values for gyroscope sensor

This CL aligns implementation of gyroscope sensor with the
specification and uses angular velocity reading values instead
of angular acceleration. Unit tests updated to verify changes.

BUG= 669765 

Review-Url: https://codereview.chromium.org/2648423005
Cr-Commit-Position: refs/heads/master@{#445974}

[modify] https://crrev.com/988f519584a682a2191c6ca72f91380f91d8166a/device/generic_sensor/generic_sensor_consts.h
[modify] https://crrev.com/988f519584a682a2191c6ca72f91380f91d8166a/device/generic_sensor/linux/sensor_data_linux.cc
[modify] https://crrev.com/988f519584a682a2191c6ca72f91380f91d8166a/device/generic_sensor/platform_sensor_and_provider_unittest_linux.cc
[modify] https://crrev.com/988f519584a682a2191c6ca72f91380f91d8166a/device/generic_sensor/platform_sensor_and_provider_unittest_win.cc
[modify] https://crrev.com/988f519584a682a2191c6ca72f91380f91d8166a/device/generic_sensor/platform_sensor_reader_win.cc

Gyroscope issue is fixed, ambient light issue is not reproduceable. Please open new bug for ambient light sensor if you think that bug is not fixed.

QA verified this issue. Gyroscope issue has been fixed.