Revert "Delete CC."

cc/output/context_provider.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 CC_OUTPUT_CONTEXT_PROVIDER_H_
+#define CC_OUTPUT_CONTEXT_PROVIDER_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "gpu/command_buffer/common/capabilities.h"
+
+class GrContext;
+
+namespace base {
+class Lock;
+}
+
+namespace gpu {
+class ContextSupport;
+namespace gles2 { class GLES2Interface; }
+}
+
+namespace cc {
+struct ManagedMemoryPolicy;
+
+class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
+ public:
+  // Bind the 3d context to the current thread. This should be called before
+  // accessing the contexts. Calling it more than once should have no effect.
+  // Once this function has been called, the class should only be accessed
+  // from the same thread.
+  virtual bool BindToCurrentThread() = 0;
+  virtual void DetachFromThread() {}
+
+  virtual gpu::gles2::GLES2Interface* ContextGL() = 0;
+  virtual gpu::ContextSupport* ContextSupport() = 0;
+  virtual class GrContext* GrContext() = 0;
+
+  struct Capabilities {
+    gpu::Capabilities gpu;
+    size_t max_transfer_buffer_usage_bytes;
+
+    Capabilities();
+  };
+
+  // Sets up a lock so this context can be used from multiple threads.
+  virtual void SetupLock() = 0;
+
+  // Returns the lock that should be held if using this context from multiple
+  // threads.
+  virtual base::Lock* GetLock() = 0;
+
+  // Returns the capabilities of the currently bound 3d context.
+  virtual Capabilities ContextCapabilities() = 0;
+
+  // Checks if the context is currently known to be lost.
+  virtual bool IsContextLost() = 0;
+
+  // Ask the provider to check if the contexts are valid or lost. If they are,
+  // this should invalidate the provider so that it can be replaced with a new
+  // one.
+  virtual void VerifyContexts() = 0;
+
+  // Delete all cached gpu resources.
+  virtual void DeleteCachedResources() = 0;
+
+  // A method to be called from the main thread that should return true if
+  // the context inside the provider is no longer valid.
+  virtual bool DestroyedOnMainThread() = 0;
+
+  // Sets a callback to be called when the context is lost. This should be
+  // called from the same thread that the context is bound to. To avoid races,
+  // it should be called before BindToCurrentThread(), or VerifyContexts()
+  // should be called after setting the callback.
+  typedef base::Closure LostContextCallback;
+  virtual void SetLostContextCallback(
+      const LostContextCallback& lost_context_callback) = 0;
+
+  // Sets a callback to be called when the memory policy changes. This should be
+  // called from the same thread that the context is bound to.
+  typedef base::Callback<void(const ManagedMemoryPolicy& policy)>
+      MemoryPolicyChangedCallback;
+  virtual void SetMemoryPolicyChangedCallback(
+      const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<ContextProvider>;
+  virtual ~ContextProvider() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_