Populate media data in APC from media session

Expose sync calls for media session info, position and metadata in the
public media session class so that they can be called by
page_content_proto_provider

Only populate media data when the feature flag
AnnotatedPageContentWithMediaData is enabled

Append media data to RenderFrameInfo for the render frame host routing
the media, and page_content_proto_util appends the media data to the
frame data.

Bug: 409427125
Change-Id: I50a69781cdd80d738597ed4a01647b0fa8e65f71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6759170
Reviewed-by: Khushal Sagar <khushalsagar@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Yiren Wang <yrw@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1490970}