Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index b2780610692b812543a7dc27428930b049803946..d2db49e30aecc4a2db3c7d0b6ae4448cff322d74 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -291,6 +291,10 @@ const char kEnableMonitorProfile[]          = "enable-monitor-profile";
 // Enables partial swaps in the WK compositor on platforms that support it.
 const char kEnablePartialSwap[]             = "enable-partial-swap";
 
+// Enables UI releasing handle to front surface for background tabs on platforms
+// that support it.
+const char kEnableUIReleaseFrontSurface[] = "enable-ui-release-front-surface";
+
 // Enables touch-screen pinch gestures.
 const char kEnablePinch[]                   = "enable-pinch";