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This CL implements MediaInternalLogRecordsImpl which works as a receiver
of batched media logs sent from renderer process using class
BatchingMediaLog::EventHandler.

MediaLog messages are grouped together in renderer and then send to
browser in bulk in order to reduce IPC pressure.

Bug: 1047457
Change-Id: Iadd747a5c17ef0572744ba3c6a4366974ed5785f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051877
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742734}