zijiehe b763e39beb Add CreateWindowCapturer() and CreateScreenCapturer() in DesktopCapturer
This change copies ScreenCapturerDifferWrapper to a new
DesktopCapturerDifferWrapper, and adds DesktopCapturer::CreateWindowCapturer and
DesktopCapturer::CreateScreenCapturer functions to replace
WindowCapturer::Create and ScreenCapturer::Create.

BUG=webrtc:6513

Review-Url: https://codereview.webrtc.org/2468753002
Cr-Commit-Position: refs/heads/master@{#14880}
2016-11-01 23:02:51 +00:00
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