Added ability to force a GLContext SwapInterval to zero.

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
diff --git a/content/common/gpu/image_transport_surface.cc b/content/common/gpu/image_transport_surface.cc
index 423a16a6d7ee0b846b478ddc1e7dc42eb281131c..f4c5a68cb218b02b354c2612ec7f3b18b4e89b63 100644
--- a/content/common/gpu/image_transport_surface.cc
+++ b/content/common/gpu/image_transport_surface.cc
@@ -141,12 +141,12 @@ void ImageTransportHelper::SetSwapInterval(gfx::GLContext* context) {
   // If Aero Glass is enabled, then the renderer will handle ratelimiting and
   // there's no tearing, so waiting for vsync is unnecessary.
   if (ui::win::IsAeroGlassEnabled()) {
-    context->SetSwapInterval(0);
+    context->ForceSwapIntervalZero(true);
     return;
   }
 #endif
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync))
-    context->SetSwapInterval(0);
+    context->ForceSwapIntervalZero(true);
   else
     context->SetSwapInterval(1);
 }