The initial render tree update (for the empty document) triggers the parsing of the default compiled-in style sheets (> 20k of data) which adds extra latency before requesting the main resource.
The initial render tree update (for the empty document) triggers the parsing of
the default compiled-in style sheets (> 20k of data) which adds extra latency
before requesting the main resource.

This CL makes Blink request the main resource upon cross-site navigation (i.e.
when a renderer process is spawned) 20ms earlier (50ms -> 30ms) on Nexus4.

BUG=359048

Review URL: https://codereview.chromium.org/222063003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@170787 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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