Chromium Tabs are reseting flash content in WebView - macos

Question

I'm working with https://github.com/rsms/chromium-tabs in my project and I have created my app so the tabs are registered to a WebView. When I'm debugging I noticed that when I was viewing a Youtube video or any flash content and I switched tabs then switch back the content reloaded or the video restarted. Is there any reason this should hapen.
When a tab is selected it is set: [self becomeFirstResponder];
Other than that I have found no other connected way the flash would reset and the rest of the page would remain the same. I'm believing its a setting in WebView whenever it is not visible.
For the comment bellow:
I followed the examples on Github and used MyTabContents.mm to create the contents. Also used a custom webview.
MyTabContents.mm:
-(id)initWithBaseTabContents:(CTTabContents*)baseContents {
if (!(self = [super initWithBaseTabContents:baseContents])) return nil;
ProgressWebView *wv = [[ProgressWebView alloc] initWithFrame:NSZeroRect];
[wv setProgressDelegate:self];
[[wv mainFrame] loadRequest:[[NSURLRequest alloc] initWithURL:[NSURL URLWithString:#"https://google.com"]]];
[wv setShouldUpdateWhileOffscreen:YES];
webView = wv;
// Create a NSScrollView to which we add the NSTextView
NSScrollView *sv = [[NSScrollView alloc] initWithFrame:NSZeroRect];
[sv setDocumentView:wv];
[sv setHasVerticalScroller:NO];
// Set the NSScrollView as our view
self.view = sv;
return self;
}
AppDelegate.mm:
- (void)applicationDidFinishLaunching:(NSNotification *)notification {
CTBrowserWindowController* windowController =
[[CTBrowserWindowController alloc] initWithBrowser:[MyBrowser browser]];
[windowController.browser addBlankTabInForeground:YES];
[windowController showWindow:self];
}
MyBrowser.mm:
-(CTTabContents*)createBlankTabBasedOn:(CTTabContents*)baseContents {
// Create a new instance of our tab type
MyTabContents *contents = [[MyTabContents alloc]
initWithBaseTabContents:baseContents];
[self changeLayout];
return [contents autorelease];
}