Expose Blimp dependencies to the embedder

blimp/client/core/compositor/blimp_compositor_dependencies.h

Index: blimp/client/core/compositor/blimp_compositor_dependencies.h
diff --git a/blimp/client/core/compositor/blimp_compositor_dependencies.h b/blimp/client/core/compositor/blimp_compositor_dependencies.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f684d9f250b72dadb125583b9215612c31bc1cb
--- /dev/null
+++ b/blimp/client/core/compositor/blimp_compositor_dependencies.h
@@ -0,0 +1,42 @@
+// 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_CORE_COMPOSITOR_BLIMP_COMPOSITOR_DEPENDENCIES_H_
+#define BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_COMPOSITOR_DEPENDENCIES_H_
+
+#include "base/memory/ptr_util.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace cc {
+class ImageSerializationProcessor;
+class TaskGraphRunner;
+}
+
+namespace blimp {
+namespace client {
+
+class CompositorDependencies;
+
+class BlimpCompositorDependencies {

[Khushal, 2016/08/24 23:22:45]

Just leave it concrete if you don't need subclasses?

[David Trainor- moved to gerrit, 2016/08/26 17:15:53]

Done.

+ public:
+  virtual ~BlimpCompositorDependencies() = default;
+
+  // External compositor dependencies provided by the embedder.
+  virtual CompositorDependencies* GetEmbedderDependencies() = 0;
+
+  // Threads shared by all BlimpCompositor instances.
+  virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
+  virtual scoped_refptr<base::SingleThreadTaskRunner>
+  GetCompositorTaskRunner() = 0;
+
+  virtual cc::ImageSerializationProcessor* GetImageSerializationProcessor() = 0;
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_COMPOSITOR_DEPENDENCIES_H_