Updated OSX to blacklist multisampling when multiple monitors are connected

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 409 matching lines @@
 
   // Note: When we create the RenderProcessHostImpl, it's technically
   //       backgrounded, because it has no visible listeners.  But the process
   //       doesn't actually exist yet, so we'll Background it later, after
   //       creation.
 }
 
 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();
   while (!queued_messages_.empty()) {
     delete queued_messages_.front();
     queued_messages_.pop();
   }
 
   ClearTransportDIBCache();
   UnregisterHost(GetID());
@@ skipping 104 matching lines @@
         base::EnvironmentVector(),
         channel_->TakeClientFileDescriptor(),
 #endif
         cmd_line,
         GetID(),
         this));
 
     fast_shutdown_started_ = false;
   }
 
+  GpuDataManagerImpl::GetInstance()->AddObserver(this);
+
   is_initialized_ = true;
   return true;
 }
 
 void RenderProcessHostImpl::CreateMessageFilters() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   channel_->AddFilter(new ResourceSchedulerFilter(GetID()));
   MediaInternals* media_internals = MediaInternals::GetInstance();;
   // Add BrowserPluginMessageFilter to ensure it gets the first stab at messages
   // from guests.
@@ skipping 1190 matching lines @@
       int32 gpu_process_host_id) {
   TRACE_EVENT0("renderer_host",
                "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwappedNoHost");
   AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
   ack_params.sync_point = 0;
   RenderWidgetHostImpl::AcknowledgeBufferPresent(route_id,
                                                  gpu_process_host_id,
                                                  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