cc: Implement shared worker contexts.

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index a5b14336ab766d262cf57c47b317d497ab7b1980..1400f3727e4e31e9f26b9d14fd4a6a15b2ffbf34 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -247,8 +247,10 @@ void GpuProcessTransportFactory::EstablishedGpuChannel(
     if (shared_worker_context_provider_) {
       base::AutoLock lock(*shared_worker_context_provider_->GetLock());
       if (shared_worker_context_provider_->ContextGL()
-              ->GetGraphicsResetStatusKHR() != GL_NO_ERROR)
+              ->GetGraphicsResetStatusKHR() != GL_NO_ERROR) {
+        shared_worker_context_provider_->Destroy();
         shared_worker_context_provider_ = nullptr;
+      }
     }
     scoped_refptr<GpuChannelHost> gpu_channel_host =
         BrowserGpuChannelHostFactory::instance()->GetGpuChannel();
@@ -267,6 +269,8 @@ void GpuProcessTransportFactory::EstablishedGpuChannel(
         if (shared_worker_context_provider_ &&
             !shared_worker_context_provider_->BindToCurrentThread())
           shared_worker_context_provider_ = nullptr;
+        if (shared_worker_context_provider_)
+          shared_worker_context_provider_->SetupLock();
       }
     }