gpu: Add flag for enabling asynchronous worker context.

content/renderer/render_widget.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.
 
 #include "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 759 matching lines @@
   attributes.alpha_size = -1;
   attributes.depth_size = 0;
   attributes.stencil_size = 0;
   attributes.samples = 0;
   attributes.sample_buffers = 0;
   attributes.bind_generates_resource = false;
   attributes.lose_context_when_out_of_memory = true;
 
   constexpr bool automatic_flushes = false;
 
-  // The compositor context shares resources with the worker context.
-  scoped_refptr<ContextProviderCommandBuffer> context_provider(
-      new ContextProviderCommandBuffer(
-          std::move(gpu_channel_host), gpu::kNullSurfaceHandle,
-          GetURLForGraphicsContext3D(), gfx::PreferIntegratedGpu,
-          automatic_flushes, limits, attributes, worker_context_provider.get(),
-          command_buffer_metrics::RENDER_COMPOSITOR_CONTEXT));
+    // The compositor context shares resources with the worker context unless
+    // the worker is async.
+    ContextProviderCommandBuffer* share_context = worker_context_provider.get();
+    if (compositor_deps_->IsAsyncWorkerContextEnabled())
+      share_context = nullptr;
+
+    scoped_refptr<ContextProviderCommandBuffer> context_provider(
+        new ContextProviderCommandBuffer(
+            std::move(gpu_channel_host), gpu::GPU_STREAM_DEFAULT,
+            gpu::GpuStreamPriority::NORMAL, gpu::kNullSurfaceHandle,
+            GetURLForGraphicsContext3D(), gfx::PreferIntegratedGpu,
+            automatic_flushes, limits, attributes, share_context,
+            command_buffer_metrics::RENDER_COMPOSITOR_CONTEXT));
 
 #if defined(OS_ANDROID)
   if (RenderThreadImpl::current()->sync_compositor_message_filter()) {
     return base::WrapUnique(new SynchronousCompositorOutputSurface(
         context_provider, worker_context_provider, routing_id(),
         output_surface_id,
         RenderThreadImpl::current()->sync_compositor_message_filter(),
         frame_swap_message_queue_));
   }
 #endif
@@ skipping 1277 matching lines @@
 }
 
 float RenderWidget::GetOriginalDeviceScaleFactor() const {
   return
       screen_metrics_emulator_ ?
       screen_metrics_emulator_->original_screen_info().deviceScaleFactor :
       device_scale_factor_;
 }
 
 }  // namespace content