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The CL is ready but causes a Warning C4267 (implicit size_t to int
conversion) in some Windows Waterfall bots (not in CQ).
After some land-archaeology, it seems that capture.gyp did not
have the warning explicitly disable, I believe it was lost in some
rebase. So, re-enabling it and relanding.

Original re-reland description -----------------------------------------
Re-reland: Make media/capture gn and gyps produce components

Reland got reverted due to a WinX64 typical issue:
warning C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data

This CL adds explicitly some buid/config/compiler/no_size_t_to_int_warning
causing C4267 in
https://build.chromium.org/p/chromium/builders/Win%20x64/builds/1472/steps/compile/logs/stdio

Original reland description -------------------------------------------
Reland: Make media/capture gn and gyps produce components

Which got reverted due to a Mac build breakage (see
https://codereview.chromium.org/2059493002/) and
a Win one  (https://crbug.com/618854).

Original description ---------------------------------------------------
Make media/capture gn and gyps produce components
This CL separates media/capture into a component,
to allow, in a subsequent CL, linking with mojo for using
ImageCapture types.

This basically reproduces the media/cast and media/midi
structure.

Windows import/export issues made necessary to add
capture_export and associated CAPTURE_EXPORT macro,
again, replicating media/midi.

gn gen ... --check uncovered some transitive dependencies
during the "analyze" phase of the bots and I had to make
them explicit (e.g. media:gpu).

BUG=518807
-----------------------------------------------------------------------
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel,mac_blink_rel,win_blink_rel

TBR=avi@chromium.org, xhwang@chromium.org, miu@chromium.org
rationale:
reland: since the PS2/3 are trivial, just making explicit libs that are
already elsewhere in media/ build files- I wonder why it didn't fail in
the bots :( .
re-reland: I'm just adding a MSVS-warning disable that was lost in a
rebase :)

Review-Url: https://codereview.chromium.org/2068763002
Cr-Commit-Position: refs/heads/master@{#400708}