Updated OSX to blacklist multisampling when multiple monitors are connected

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 7b2634a34b76e32bc6387bf4daef0522318ca11c..0e919f849d85f2740b444b227ed906ba6f1e8f38 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -427,6 +427,7 @@ RenderProcessHostImpl::RenderProcessHostImpl(
 RenderProcessHostImpl::~RenderProcessHostImpl() {
   DCHECK(!run_renderer_in_process());
   ChildProcessSecurityPolicyImpl::GetInstance()->Remove(GetID());
+  GpuDataManagerImpl::GetInstance()->RemoveObserver(this);
 
   // We may have some unsent messages at this point, but that's OK.
   channel_.reset();
@@ -551,6 +552,8 @@ bool RenderProcessHostImpl::Init() {
     fast_shutdown_started_ = false;
   }
 
+  GpuDataManagerImpl::GetInstance()->AddObserver(this);
+
   is_initialized_ = true;
   return true;
 }
@@ -1761,4 +1764,20 @@ void RenderProcessHostImpl::OnCompositorSurfaceBuffersSwappedNoHost(
                                                  ack_params);
 }
 
+void RenderProcessHostImpl::OnGpuSwitching() {
+  for (RenderWidgetHostsIterator iter = GetRenderWidgetHostsIterator();
+       !iter.IsAtEnd();
+       iter.Advance()) {
+    const RenderWidgetHost* widget = iter.GetCurrentValue();
+    DCHECK(widget);
+    if (!widget || !widget->IsRenderView())
+      continue;
+
+    RenderViewHost* rvh =
+        RenderViewHost::From(const_cast<RenderWidgetHost*>(widget));
+
+    rvh->UpdateWebkitPreferences(rvh->GetWebkitPreferences());
+  }
+}
+
 }  // namespace content