Creating PNG images from web content to be used by OverviewMode navigation

athena/content/web_activity.cc

Index: athena/content/web_activity.cc
diff --git a/athena/content/web_activity.cc b/athena/content/web_activity.cc
index 275acedbc6dfc7a2070aa510e04ddabff99b7b72..bbb77213844c1e796936310b413d311ddd0b27ab 100644
--- a/athena/content/web_activity.cc
+++ b/athena/content/web_activity.cc
@@ -548,10 +548,10 @@ views::Widget* WebActivity::CreateWidget() {
   return NULL;  // Use default widget.
 }
 
-gfx::ImageSkia WebActivity::GetOverviewModeImage() {
+gfx::Image WebActivity::GetOverviewModeImage() {
   if (content_proxy_.get())
     content_proxy_->GetContentImage();
-  return gfx::ImageSkia();
+  return gfx::Image();
 }
 
 void WebActivity::PrepareContentsForOverview() {