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This is part of work to control the Mojo interfaces available to
prerendered pages. See design doc[1] for more details.

In addition to content/, embedders define their own Mojo interfaces,
so they need to add their binding policies.
This CL adds a new content API named MojoBinderPolicyMap that allows
embedders to register policies for embedder-specific interfaces by
overriding ContentBrowserClient::RegisterMojoBinderPolicyMap method.

[1] https://docs.google.com/document/d/1E3Ma8HQFmxx8OvWVrjqpLziYIRbTRgLat4cM-nyKB6w/edit?usp=sharing

Bug: 1132752
Change-Id: Ie47a9fc2517fd3cda8438e9c61a5fa6854a8f36d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507230Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Lingqi Chi <lingqi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836539}