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Previously, these histograms were recorded prior to startup
temperature evaluation, which caused almost (*) no data to be
recorded in temperature-suffixed histograms. With this CL,
the values are stored in global variable and recorded to
appropriate histograms after the startup temperature is
evaluated.

(*) Most of the time, the browser window is displayed
    before startup temperature evaluation. However, if
    Chrome is launched with --silent-launch, the first
    window can be displayed later. That may explain why
    we see a few samples in temperature-suffixed
    BrowserWindowDisplay histograms. With this CL, any
    browser window display that happens after normal
    startup won't be recorded to an histogram.

Bug: 580207, 589118
Change-Id: I8419df6f42df64f60be0858462159a276d17557e
Reviewed-on: https://chromium-review.googlesource.com/1167470Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582302}