Current implementation requires MouseCursorMonitor to understand the SourceId of
a DesktopCapturer implementation. But SourceId has different meanings across
various DesktopCapturer implementations. So this change decouples the
MouseCursorMonitor from DesktopCapturer, i.e. it does not need to know
DesktopCapturer anymore, instead it always returns the absolute position of the
mouse cursor. In DesktopAndCursorComposer, it can use the newly added
DesktopFrame::top_left() to decide the relative position of mouse cursor and the
DesktopFrame.
Bug: webrtc:7950
Change-Id: Idfbde5cb0f79ff0acf4ad1e9a0ac5126f1bb2e98
Reviewed-on: https://chromium-review.googlesource.com/575315
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#19115}
cd66a771ed