Request context sharing via content::ContextProviderCommandBuffer

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 202 matching lines @@
   // framebuffer doesn't need alpha, depth, stencil, antialiasing.
   gpu::gles2::ContextCreationAttribHelper attributes;
   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;
 
-  bool share_resources = true;
   bool automatic_flushes = false;
 
   return base::WrapUnique(new content::WebGraphicsContext3DCommandBufferImpl(
       gpu::kNullSurfaceHandle, url, gpu_channel_host.get(), attributes,
-      gfx::PreferIntegratedGpu, share_resources, automatic_flushes, nullptr));
+      gfx::PreferIntegratedGpu, automatic_flushes));
 }
 
 }  // namespace
 
 namespace content {
 
 // RenderWidget ---------------------------------------------------------------
 
 RenderWidget::RenderWidget(CompositorDependencies* compositor_deps,
                            blink::WebPopupType popup_type,
@@ skipping 534 matching lines @@
     }
 
     gpu::SharedMemoryLimits limits;
     // The renderer compositor context doesn't do a lot of stuff, so we don't
     // expect it to need a lot of space for commands or transfer. Raster and
     // uploads happen on the worker context instead.
     limits.command_buffer_size = 64 * 1024;
     limits.start_transfer_buffer_size = 64 * 1024;
     limits.min_transfer_buffer_size = 64 * 1024;
 
-    context_provider = new ContextProviderCommandBuffer(
-        CreateOffscreenContext(std::move(gpu_channel_host),
-                               GetURLForGraphicsContext3D()),
-        limits, RENDER_COMPOSITOR_CONTEXT);
     worker_context_provider =
         RenderThreadImpl::current()->SharedWorkerContextProvider();
     if (!worker_context_provider) {
       // Cause the compositor to wait and try again.
       return nullptr;
     }
 
+    // The compositor context shares resources with the worker context.
+    context_provider = new ContextProviderCommandBuffer(
+        CreateOffscreenContext(std::move(gpu_channel_host),
+                               GetURLForGraphicsContext3D()),
+        limits, worker_context_provider.get(), RENDER_COMPOSITOR_CONTEXT);
+
 #if defined(OS_ANDROID)
     if (RenderThreadImpl::current() &&
         RenderThreadImpl::current()->sync_compositor_message_filter()) {
       uint32_t output_surface_id = next_output_surface_id_++;
       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_));
     }
@@ skipping 1299 matching lines @@
 }
 
 float RenderWidget::GetOriginalDeviceScaleFactor() const {
   return
       screen_metrics_emulator_ ?
       screen_metrics_emulator_->original_screen_info().deviceScaleFactor :
       device_scale_factor_;
 }
 
 }  // namespace content