Expose Blimp dependencies to the embedder

blimp/client/public/compositor/compositor_dependencies.h

Index: blimp/client/public/compositor/compositor_dependencies.h
diff --git a/blimp/client/public/compositor/compositor_dependencies.h b/blimp/client/public/compositor/compositor_dependencies.h
new file mode 100644
index 0000000000000000000000000000000000000000..12b60d9a7fb23524084619d13336386c47d3db90
--- /dev/null
+++ b/blimp/client/public/compositor/compositor_dependencies.h
@@ -0,0 +1,41 @@
+// 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 BLIMP_CLIENT_PUBLIC_COMPOSITOR_COMPOSITOR_DEPENDENCIES_H_
+#define BLIMP_CLIENT_PUBLIC_COMPOSITOR_COMPOSITOR_DEPENDENCIES_H_
+
+#include "base/callback.h"
+#include "base/memory/ptr_util.h"
+
+namespace cc {
+class ContextProvider;
+class LayerTreeSettings;
+class SurfaceManager;
+}

[Khushal, 2016/08/24 23:22:46]

nit: terminate namespace for this and gpu.

[David Trainor- moved to gerrit, 2016/08/26 17:15:54]

Done.

+
+namespace gpu {
+class GpuMemoryBufferManager;
+}
+
+namespace blimp {
+namespace client {
+
+class CompositorDependencies {
+ public:
+  using ContextProviderCallback =
+      base::Callback<void(scoped_refptr<cc::ContextProvider>)>;
+
+  virtual ~CompositorDependencies() = default;
+
+  virtual std::unique_ptr<cc::LayerTreeSettings> GetLayerTreeSettings() = 0;

[Khushal, 2016/08/24 23:22:46]

Since Chrome might not be able to do this for us right now, do you want to keep
it internal? Xing can change it to public once he hooks that up in his patch.

[David Trainor- moved to gerrit, 2016/08/26 17:15:54]

I'll pull the LayerTreeSettings from //blimp/client/support out to a static
helper.

+  virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
+  virtual cc::SurfaceManager* GetSurfaceManager() = 0;
+  virtual uint32_t AllocateSurfaceId() = 0;
+  virtual void GetContextProvider(const ContextProviderCallback& callback) = 0;
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_PUBLIC_COMPOSITOR_COMPOSITOR_DEPENDENCIES_H_