The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c92ec9bd3c7863410f457d03aa741f999bf3f224

commit c92ec9bd3c7863410f457d03aa741f999bf3f224
Author: Xiangjun Zhang <xjz@chromium.org>
Date: Tue Jul 25 21:56:42 2017

Remove the viewport fill debouncer timer.

This CL removed the viewport fill debouncer timer and added a delayed 
start mechanism to monitor that all requirements are met and held 
stable for a short period of time before switching to media remoting. 
The content bitrate will also be estimated and evaluated in this period
in an incoming change. 

Also stopped using fullscreen status in the remoting switching logic to
avoid conflict and racing between fullscreen status change and dominant
status change.

Bug:  739815 ,  739972 
Change-Id: I924d8fbdce7dddd2f1f334aeacae4cdc2b58c455
Reviewed-on: https://chromium-review.googlesource.com/571238
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Anton Vayvod <avayvod@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489455}
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/media/base/media_observer.h
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/media/blink/webmediaplayer_impl.cc
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/media/remoting/renderer_controller.cc
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/media/remoting/renderer_controller.h
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/media/remoting/renderer_controller_unittest.cc
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/third_party/WebKit/Source/core/html/HTMLMediaElement.h
[modify] https://crrev.com/c92ec9bd3c7863410f457d03aa741f999bf3f224/third_party/WebKit/Source/core/html/MediaElementFillingViewportTest.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41

commit 8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41
Author: Xiangjun Zhang <xjz@chromium.org>
Date: Wed Aug 02 07:12:42 2017

Media Remoting: Add content bitrate estimation and condition check.

When network bandwidth is not sufficient to remote the content directly
to the receiver, media remoting will fallback to mirroring. To avoid
this fallback happen immediately after remoting starts, estimate the
content bitrate and only start remoting when the network bandwidth is
sufficient.

Bug:  739972 
Change-Id: I2bae3bed042ab1f6d6946877213729b18043dc7d
Reviewed-on: https://chromium-review.googlesource.com/567031
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491289}
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/base/media_observer.h
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/remoting/metrics.cc
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/remoting/metrics.h
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/remoting/renderer_controller.cc
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/remoting/renderer_controller.h
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/media/remoting/renderer_controller_unittest.cc
[modify] https://crrev.com/8f6cf3ba941c2df27c9d416c0eb1e21bb492ad41/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/64a33c3333033a98e80130522c9455b94020ea60

commit 64a33c3333033a98e80130522c9455b94020ea60
Author: Xiangjun Zhang <xjz@chromium.org>
Date: Thu Aug 03 17:14:20 2017

Media Remoting: Get estimated network bandwidth from Remoter.

This CL adds the interface to get estimated network capacity from
Remoter. A follow up CL will check whether the network bandwidth is
sufficient to activate media remoting.

Bug:  739972 
Change-Id: Ica6aee81b23894748951fc8f27afcf74dabb6a28
Reviewed-on: https://chromium-review.googlesource.com/587507
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491772}
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/chrome/browser/media/cast_remoting_connector.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/chrome/browser/media/cast_remoting_connector.h
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/chrome/browser/media/cast_remoting_connector_unittest.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/mojo/interfaces/mirror_service_remoting.mojom
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/mojo/interfaces/remoting.mojom
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/end2end_test_renderer.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/fake_remoter.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/fake_remoter.h
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/renderer_controller.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/renderer_controller.h
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/shared_session.cc
[modify] https://crrev.com/64a33c3333033a98e80130522c9455b94020ea60/media/remoting/shared_session.h

xjz@:  It looks like work wrapped up on this in August 2017.  Should this be kept open (at a lower priority) or closed?

Close this for now. May open another issue later to get the true network bandwidth estimate with mirroring service.

Thanks!

I think it was Pri-1 at the time you worked on it :-)  But change it back if you feel strongly.