sergeyu cc9669c6b8 Cleanup shared memory handling in DesktopCapturer interface.
Previously shared memory buffers for DesktopCapturer were created
using DesktopCapturer::Callback::CreateSharedBuffer(). That made it
difficult to proxy DesktopCapturer interface from one thread to another.
This CL adds SharedBufferFactory interface that's allowed to be called
on a background thread. This also simplifies clients that don't
need to use shared memory, as they no longer need to override
CreateSharedBuffer().

Review URL: https://codereview.webrtc.org/1678073003

Cr-Commit-Position: refs/heads/master@{#11543}
2016-02-09 23:13:32 +00:00
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