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Xiangjun Zhang authoredObserve the target WebContents for Tab/OffscreenTab mirroring. Bug: 734672 Change-Id: I65194a345f81b38967396c80e5f614d4119782e4 Reviewed-on: https://chromium-review.googlesource.com/1176110Reviewed-by: Yuri Wiitala <miu@chromium.org> Commit-Queue: Xiangjun Zhang <xjz@chromium.org> Cr-Commit-Position: refs/heads/master@{#586097} 81835381