Add subscribeUniform extension pipeline

gpu/command_buffer/service/uniform_subscription_manager.h

Index: gpu/command_buffer/service/uniform_subscription_manager.h
diff --git a/gpu/command_buffer/service/uniform_subscription_manager.h b/gpu/command_buffer/service/uniform_subscription_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..0606f56b794c2c336906b72bad8041cb85e442ef
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+++ b/gpu/command_buffer/service/uniform_subscription_manager.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2014 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 GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_
+
+#include <map>
+
+#include "base/memory/ref_counted.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+// This class keeps track of the mapping of uniform names to types,
+// along with the current uniform state
+class GPU_EXPORT UniformSubscriptionManager {
+ public:
+  typedef std::map<GLenum, const GLchar*> SubscriptionMap;
+
+  UniformSubscriptionManager();
+  ~UniformSubscriptionManager();
+
+  void Destroy(bool have_context);
+
+  void AddSubscription(GLenum target, const GLchar* name);
+  void RemoveSubscription(GLenum target);
+
+  SubscriptionMap subscriptions() { return subscriptions_; }
+
+ private:
+  SubscriptionMap subscriptions_;
+
+  DISALLOW_COPY_AND_ASSIGN(UniformSubscriptionManager);
+};
+
+}  // namespage gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_UNIFORM_SUBSCRIPTION_MANAGER_H_