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This adds a few constructors to SharedWindowedAnalyzerClient
and switches over all call sites that use initializer lists
to use a constructor instead. The upcoming FrameMetrics class
will use the "max_window_size" constructor.

Bug: 807463
Change-Id: Ie1d21b90ce00dff84d41c30e9563a9fba4ba67f5
Reviewed-on: https://chromium-review.googlesource.com/981415
Commit-Queue: Brian Anderson <brianderson@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548508}