Decouple browser-specific GPU IPC messages from GPU service IPCs

content/common/gpu/gpu_channel_manager_delegate.h

+// Copyright 2016 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_GPU_CHANNEL_MANAGER_DELEGATE_H_
+#define CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_DELEGATE_H_
+
+namespace content {
+
+struct GPUMemoryUmaStats;
+
+class GpuChannelManagerDelegate {
+ public:
+  // Tells the delegate that a context has subscribed to a new target and
+  // the browser should start sending the corresponding information
+  virtual void AddSubscription(int32_t client_id, unsigned int target) = 0;
+
+  // Tells the delegate to cache the given shader information in persistent
+  // storage. The embedder is expected tor epopulate the in-memory cache through
+  // the respective GpuChannelManager API.
+  virtual void StoreShaderToDisk(int32_t client_id,
+                                 const std::string& key,
+                                 const std::string& shader) = 0;
+
+  // Response from GPU to an EstablishChannel request.
+  virtual void ChannelEstablished(const IPC::ChannelHandle& channel_handle) = 0;
+
+  // Tells the delegate that an offscreen context was created for the provided
+  // |active_url|.
+  virtual void DidCreateOffscreenContext(const GURL& active_url) = 0;
+
+  // Notification from GPU that the channel is destroyed.
+  virtual void DidDestroyChannel(int client_id) = 0;
+
+  // Tells the delegate that an offscreen context was destroyed for the provided
+  // |active_url|.
+  virtual void DidDestroyOffscreenContext(const GURL& active_url) = 0;
+
+  // Tells the delegate that a context was lost.
+  virtual void DidLoseContext(bool offscreen,
+                              gpu::error::ContextLostReason reason,
+                              const GURL& active_url) = 0;
+
+  // Tells the delegate about GPU memory usage statistics for UMA logging.
+  virtual void GpuMemoryUmaStats(const GPUMemoryUmaStats& params) = 0;
+
+  // Tells the delegate that no contexts are subscribed to the target anymore
+  // so the delegate should stop sending the corresponding information.
+  virtual void RemoveSubscription(int32_t client_id, unsigned int target) = 0;
+
+ protected:
+  virtual ~GpuChannelManagerDelegate() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_DELEGATE_H_