Reduce the number of calls to Browser.GetSystemInfo.

While adding some debug logging, it was discovered that hundreds of
calls to this API were being made upon browser restart while building
the TestExpectations cache. Cache the result.

Bug: 797368
Change-Id: Ic3ae33928e90759ce933b93a74abb897e4a1fb51
Commit-Queue: Kenneth Russell <>
Reviewed-by: Kenneth Russell <>
Cr-Commit-Position: refs/heads/master@{#531147}
1 file changed