That code you linked to should still work without changes, since that signal comes back via IPC anyways. The only potential complication is that VizDisplayCompositor (as implemented in VizProcessTransportFactory) uses a single ContextProvider for all compositors. I think there is only ever one active CompositorImpl on Android though, so that wouldn't be an issue?

Discussed with samans@ - going to take a look at this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fb43e0f4aa38ace18067d147e29035f646eb318b

commit fb43e0f4aa38ace18067d147e29035f646eb318b
Author: Eric Karl <ericrk@chromium.org>
Date: Tue Jun 12 18:43:20 2018

Handle Swap notifications for Android OOP-D

Android OOP-D doesn't currently receive swap notifications, as the
output surface has moved to the Viz process. This patch adds IPCs to
deliver these notifications via DisplayClient.

In order to reduce complexity and IPC spam, these notifications will
only be delivered on platforms that require them, as indicated in
RootCompositorFrameSinkParams.

Bug:  811970 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I5ddc23c59b7c6a5851e9f82d2bcb18c12bb25839
Reviewed-on: https://chromium-review.googlesource.com/1087869
Reviewed-by: Saman Sami <samans@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566515}
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/android_webview/browser/surfaces_instance.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/cc/test/fake_output_surface_client.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/display.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/display.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/display_client.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/display_unittest.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/output_surface.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/output_surface.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display/output_surface_client.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/display_provider.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/gl_output_surface.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/gl_output_surface.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/gpu_display_provider.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/gpu_display_provider.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/skia_output_surface_impl.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/skia_output_surface_impl.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/skia_output_surface_impl_on_gpu.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/display_embedder/skia_output_surface_impl_on_gpu.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/frame_sinks/direct_layer_tree_frame_sink.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/frame_sinks/direct_layer_tree_frame_sink.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/frame_sinks/frame_sink_manager_impl.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/frame_sinks/root_compositor_frame_sink_impl.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/service/frame_sinks/root_compositor_frame_sink_impl.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/test/mock_display_client.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/test/test_display_provider.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/test/test_display_provider.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/test/test_layer_tree_frame_sink.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/components/viz/test/test_layer_tree_frame_sink.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/browser/compositor/in_process_display_client.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/browser/compositor/in_process_display_client.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/browser/renderer_host/compositor_impl_android.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/browser/renderer_host/compositor_impl_android.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/browser/renderer_host/compositor_impl_android_browsertest.cc
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/content/renderer/android/synchronous_layer_tree_frame_sink.h
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/services/viz/privileged/interfaces/compositing/display_private.mojom
[modify] https://crrev.com/fb43e0f4aa38ace18067d147e29035f646eb318b/services/viz/privileged/interfaces/compositing/frame_sink_manager.mojom