The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fca78fd5c8e776774195ad2af6abdecfbac14024

commit fca78fd5c8e776774195ad2af6abdecfbac14024
Author: Alexei Filippov <alph@chromium.org>
Date: Tue May 01 21:59:50 2018

DevTools: Remove page reloading blanket

DevTools used to place a "reloading blanket" over a page when DevTools are open
and performance session being recorded.

The patch removes page screen tampering logic and records whatever is
really being dispalyed.

BUG= 837874 

Change-Id: Id50385477069400451f445017f53998d0a0cdee8
Reviewed-on: https://chromium-review.googlesource.com/1033505
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555193}
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/exported/web_dev_tools_agent_impl.cc
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/exported/web_dev_tools_agent_impl.h
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/exported/web_view_impl.cc
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/inspector/InspectorOverlayPage.html
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/inspector/inspector_overlay_agent.cc
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/inspector/inspector_overlay_agent.h
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/inspector/inspector_tracing_agent.cc
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/inspector/inspector_tracing_agent.h
[modify] https://crrev.com/fca78fd5c8e776774195ad2af6abdecfbac14024/third_party/blink/renderer/core/probe/CoreProbes.json5

@Alexei Filippov: Could you please provide the test steps which helps in verifying the fix from TE end.

Thanks!

To reproduce:
1. Open a webpage e.g. theverge.com
2. Open DevTools performance panel and record reload (Ctrl-Shift-E)
3. In the recorded profile's screenshots overview should be no white region in the middle.

See the screenshot with before (top) and after (bottom).

Deleted: Screenshot from 2018-05-02 11-56-18.png 175 KB

	Screenshot from 2018-05-02 11-56-18.png 175 KB View Download