Add SwapFrame() to VideoSendStreamInput.

Optionally prevents doing a frame copy when putting frames into a
VideoSendStream. PutFrame() is still there, which copies the frame.

Also removes time_since_capture_ms as a parameter, since
I420VideoFrame::render_time_ms() denotes when the frame was captured.

BUG=2657
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5119004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5265 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/webrtc.gyp

@@ -39,6 +39,7 @@
       'conditions': [
         ['include_tests==1', {
           'dependencies': [
+            'common_video/common_video_unittests.gyp:*',
             'system_wrappers/source/system_wrappers_tests.gyp:*',
             'test/metrics.gyp:*',
             'test/test.gyp:*',