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Now Renderer::SetVolume will be called before Initialize, which allows
some renderers to do optimization.

CastRenderer volume change relies on MediaPipelineImpl, which is only
available after Initialize. Thus we have to cache the value and set
volume after MediaPipelineImpl becomes available.

Bug: internal b/161747143
Test: Build
Change-Id: I913a2fa5bab102543561725f47e0b7ea19289aa2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314985Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791136}