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 5fdc05b7790632d2ee295ced5e165996501b76ec..6b562d216914642cfb393ccb98b3837ce83df5c3 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -396,7 +396,9 @@ RenderProcessHostImpl::RenderProcessHostImpl(
           dummy_shutdown_event_(false, false),
 #endif
           supports_browser_plugin_(supports_browser_plugin),
-          is_guest_(is_guest) {
+          is_guest_(is_guest),
+          gpu_switch_callback_(base::Bind(&RenderProcessHostImpl::OnGpuSwitch,
+              base::Unretained(this))) {
   widget_helper_ = new RenderWidgetHelper();
 
   ChildProcessSecurityPolicyImpl::GetInstance()->Add(GetID());
@@ -424,6 +426,8 @@ RenderProcessHostImpl::RenderProcessHostImpl(
 RenderProcessHostImpl::~RenderProcessHostImpl() {
   DCHECK(!run_renderer_in_process());
   ChildProcessSecurityPolicyImpl::GetInstance()->Remove(GetID());
+  GpuDataManagerImpl::GetInstance()->RemoveGpuSwitchCallback(
+      gpu_switch_callback_);
 
   // We may have some unsent messages at this point, but that's OK.
   channel_.reset();
@@ -544,6 +548,8 @@ bool RenderProcessHostImpl::Init() {
     fast_shutdown_started_ = false;
   }
 
+  GpuDataManagerImpl::GetInstance()->AddGpuSwitchCallback(gpu_switch_callback_);
+
   is_initialized_ = true;
   return true;
 }
@@ -1748,4 +1754,20 @@ void RenderProcessHostImpl::OnCompositorSurfaceBuffersSwappedNoHost(
                                                  ack_params);
 }
 
+void RenderProcessHostImpl::OnGpuSwitch() {
+  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