Decouple browser-specific GPU IPC messages from GPU service IPCs

content/common/gpu/gpu_channel_manager_delegate.h

+// Copyright 2015 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:
+  virtual void AddSubscription(int32_t client_id, unsigned int target) = 0;
+
+  virtual void CacheShader(int32_t client_id,

[no sievers, 2016/02/19 00:19:24]

nit: Maybe this could be StoreShaderToDisk() (you can add a comment that this is
for the embedder to provide persistent storage and the embedder is further
expected to repopulate the in-memory cache through the respective
GpuChannelManager API.)

[Fady Samuel, 2016/02/19 01:13:11]

Done.

+                           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;
+
+  // Notification from GPU that the channel is destroyed.
+  virtual void DestroyChannel(int client_id) = 0;

[no sievers, 2016/02/19 00:19:24]

nit: how about DidDestroyChannel()?

[Fady Samuel, 2016/02/19 01:13:11]

Done.

+
+  virtual void DidCreateOffscreenContext(const GURL& active_url) = 0;
+
+  virtual void DidDestroyOffscreenContext(const GURL& active_url) = 0;
+
+  virtual void DidLoseContext(bool offscreen,
+                              gpu::error::ContextLostReason reason,
+                              const GURL& active_url) = 0;
+
+  virtual void GpuMemoryUmaStats(const GPUMemoryUmaStats& params) = 0;
+
+  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_