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 378 matching lines @@
           is_initialized_(false),
           id_(ChildProcessHostImpl::GenerateChildProcessUniqueId()),
           browser_context_(browser_context),
           storage_partition_impl_(storage_partition_impl),
           sudden_termination_allowed_(true),
           ignore_input_events_(false),
 #if defined(OS_ANDROID)
           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());
 
   CHECK(!g_exited_main_message_loop);
   RegisterHost(GetID(), this);
   g_all_hosts.Get().set_check_on_null_data(true);
   // Initialize |child_process_activity_time_| to a reasonable value.
   mark_child_process_activity_time();
 
   if (!GetBrowserContext()->IsOffTheRecord() &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableGpuShaderDiskCache)) {
     BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                             base::Bind(&CacheShaderInfo, GetID(),
                                        storage_partition_impl_->GetPath()));
   }
 
   // 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()->RemoveGpuSwitchCallback(
+      gpu_switch_callback_);
 
   // 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 100 matching lines @@
         base::EnvironmentVector(),
         channel_->TakeClientFileDescriptor(),
 #endif
         cmd_line,
         GetID(),
         this));
 
     fast_shutdown_started_ = false;
   }
 
+  GpuDataManagerImpl::GetInstance()->AddGpuSwitchCallback(gpu_switch_callback_);
+
   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 1184 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::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