From bbb1f124671be7b7dc2c540ad428306eeceecfdb Mon Sep 17 00:00:00 2001
From: Jim Graham <50503328+flar@users.noreply.github.com>
Date: Wed, 11 Sep 2019 19:08:56 -0700
Subject: [PATCH] Adjust iOS frame start times to match the platform info
 (#11802)

---
 shell/platform/darwin/ios/framework/Source/vsync_waiter_ios.mm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/shell/platform/darwin/ios/framework/Source/vsync_waiter_ios.mm b/shell/platform/darwin/ios/framework/Source/vsync_waiter_ios.mm
index 8fbe25c86..a920f826f 100644
--- a/shell/platform/darwin/ios/framework/Source/vsync_waiter_ios.mm
+++ b/shell/platform/darwin/ios/framework/Source/vsync_waiter_ios.mm
@@ -114,7 +114,8 @@ float VsyncWaiterIOS::GetDisplayRefreshRate() const {
 }
 
 - (void)onDisplayLink:(CADisplayLink*)link {
-  fml::TimePoint frame_start_time = fml::TimePoint::Now();
+  CFTimeInterval delay = CACurrentMediaTime() - link.timestamp;
+  fml::TimePoint frame_start_time = fml::TimePoint::Now() - fml::TimeDelta::FromSecondsF(delay);
   fml::TimePoint frame_target_time = frame_start_time + fml::TimeDelta::FromSecondsF(link.duration);
 
   display_link_.get().paused = YES;
-- 
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