TabCapture: enforce active refresh if there is un-sampled compositor update

media/capture/content/video_capture_oracle.h

Index: media/capture/content/video_capture_oracle.h
diff --git a/media/capture/content/video_capture_oracle.h b/media/capture/content/video_capture_oracle.h
index 8d545e29a61c3ea16f0e462dc35b68c42f41d723..3f62c7255c59e5803a1869ae825ac1f2f45db67a 100644
--- a/media/capture/content/video_capture_oracle.h
+++ b/media/capture/content/video_capture_oracle.h
@@ -145,6 +145,11 @@ class CAPTURE_EXPORT VideoCaptureOracle {
   // sanity-check that event times are monotonically non-decreasing.
   base::TimeTicks last_event_time_[kNumEvents];
 
+  // Set to true if there have been updates to the source content that were not
+  // sampled. This will prevent passive refresh requests from being satisfied
+  // when an active refresh should be used instead.
+  bool source_is_dirty_;
+
   // Updated by the last call to ObserveEventAndDecideCapture() with the
   // estimated duration of the next frame to sample.  This is zero if the method
   // returned false.