Chrome version: 68.0.3438.0 (Official Build) Revision 92f33534f404595554fb708537b29568da70f384-refs/branch-heads/3438@{#1} (64-bit) 
OS:Mac OS X(10.12.6,10.13.1,10.13.5)

Pre-Condition:Enable 'Use Views browser windows instead of Cocoa'from chrome://flags.

Steps to reproduce:
1.Launch chrome and navigate to gmail.com. 
2.Observe loading of page.

Actual Result:Unwanted grey patch is seen while loading any internal/webpage.
Expected Result:Page should load properly without any patches.

This is regression issue broken in ‘M-68’ and providing per-revision bisect info below:
Good Build:68.0.3437.0(Revision:560454)  
Bad Build:68.0.3438.0(Revision:560883)
 
You are probably looking for a change made after 560828 (known good), but no later than 560829 (first known bad).
CHANGE-LOG URL:
The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/65421f69a6e0e69991c3d6521f98efa8647b547f..0d7d74584f957455326b334f3476be4720b70353
Suspecting:https://chromium.googlesource.com/chromium/src/+/0d7d74584f957455326b334f3476be4720b70353

@Fady Samuel: Could you please help to reassign if your change is not the cause for this change.

Note:Issue is only  reproducible on MAC(10.12.6,10.13.1,10.13.5) OS.

Kindly review the attached screen-cast .
Thank You!



 

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	Expected_Result.mov 6.4 MB View Download