UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
Hi Team,

I am using headless browser from c++ code.
My requirement  is to take page screenshot.
Following is the code called from OnPageReady():

					devtools_client_->GetEmulation()->GetExperimental()->SetVisibleSize(headless::emulation::SetVisibleSizeParams::Builder()
					.SetHeight(900)
					.SetWidth(900)
					.Build());

					devtools_client_->GetEmulation()->SetDeviceMetricsOverride(900,
						900,
						1,
						false);

					devtools_client_->GetEmulation()->GetExperimental()->SetPageScaleFactor(headless::emulation::SetPageScaleFactorParams::Builder()
						.SetPageScaleFactor(1).Build());

					devtools_client_->GetPage()->GetExperimental()->CaptureScreenshot(
						headless::page::CaptureScreenshotParams::Builder()
						.SetClip(headless::page::Viewport::Builder()
							.SetX(0)
							.SetY(0)
							.SetScale(1)
							.SetHeight(900)
							.SetWidth(900)
							.Build())
						.SetFormat(headless::page::CaptureScreenshotFormat::PNG)
						.SetFromSurface(true)
						.Build(),
						base::Bind(&HeadlessExample::OnScreenshotCaptured,
							weak_factory_.GetWeakPtr())); 

But my issue is that OnScreenshotCaptured function does not get called.
Please help.

Ankur Sehgal.

What is the expected behavior?
function OnScreenshotCaptured should get invoked

What went wrong?
function OnScreenshotCaptured not called

Did this work before? N/A 

Chrome version: 67.0.3396.99  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: