Request context sharing via content::ContextProviderCommandBuffer

content/common/gpu/client/context_provider_command_buffer.h

 // Copyright (c) 2013 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_
 #define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_
 
 #include <stdint.h>
 
 #include <memory>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "cc/blink/context_provider_web_context.h"
 #include "cc/output/context_provider.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/client/command_buffer_metrics.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "gpu/command_buffer/client/shared_memory_limits.h"
@@ skipping 12 matching lines @@
 namespace content {
 
 // Implementation of cc::ContextProvider that provides a
 // WebGraphicsContext3DCommandBufferImpl context and a GrContext.
 class CONTENT_EXPORT ContextProviderCommandBuffer
     : NON_EXPORTED_BASE(public cc_blink::ContextProviderWebContext) {
  public:
   ContextProviderCommandBuffer(
       std::unique_ptr<WebGraphicsContext3DCommandBufferImpl> context3d,
       const gpu::SharedMemoryLimits& memory_limits,
+      ContextProviderCommandBuffer* shared_context_provider,
       CommandBufferContextType type);
 
   gpu::CommandBufferProxyImpl* GetCommandBufferProxy();
 
   // cc_blink::ContextProviderWebContext implementation.
   WebGraphicsContext3DCommandBufferImpl* WebContext3D() override;
 
   // cc::ContextProvider implementation.
   bool BindToCurrentThread() override;
   void DetachFromThread() override;
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
   class GrContext* GrContext() override;
   void InvalidateGrContext(uint32_t state) override;
   void SetupLock() override;
   base::Lock* GetLock() override;
   gpu::Capabilities ContextCapabilities() override;
   void DeleteCachedResources() override;
   void SetLostContextCallback(
       const LostContextCallback& lost_context_callback) override;
 
  protected:
   ~ContextProviderCommandBuffer() override;
 
   void OnLostContext();
 
  private:
+  struct SharedProviders : public base::RefCountedThreadSafe<SharedProviders> {
+    base::Lock lock;
+    std::vector<ContextProviderCommandBuffer*> list;
+
+    SharedProviders();
+
+   private:
+    friend class base::RefCountedThreadSafe<SharedProviders>;
+    ~SharedProviders();
+  };
+
   base::ThreadChecker main_thread_checker_;
   base::ThreadChecker context_thread_checker_;
 
+  scoped_refptr<SharedProviders> shared_providers_;
+
   std::unique_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
   std::unique_ptr<gpu::gles2::GLES2TraceImplementation> trace_impl_;
   std::unique_ptr<skia_bindings::GrContextForGLES2Interface> gr_context_;
 
   gpu::SharedMemoryLimits memory_limits_;
   CommandBufferContextType context_type_;
   std::string debug_name_;
 
   LostContextCallback lost_context_callback_;
 
   base::Lock context_lock_;
 
   class LostContextCallbackProxy;
   std::unique_ptr<LostContextCallbackProxy> lost_context_callback_proxy_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_