Add subscribeUniform extension pipeline

gpu/command_buffer/service/uniform_subscription_manager.cc

Index: gpu/command_buffer/service/uniform_subscription_manager.cc
diff --git a/gpu/command_buffer/service/uniform_subscription_manager.cc b/gpu/command_buffer/service/uniform_subscription_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3e942cb4c70f72ce0a83e527e039e233868776fa
--- /dev/null
+++ b/gpu/command_buffer/service/uniform_subscription_manager.cc
@@ -0,0 +1,30 @@
+// 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.
+
+#include "gpu/command_buffer/service/uniform_subscription_manager.h"
+
+namespace gpu {
+namespace gles2 {
+
+UniformSubscriptionManager::UniformSubscriptionManager() {
+}
+
+UniformSubscriptionManager::~UniformSubscriptionManager() {
+}
+
+void UniformSubscriptionManager::Destroy(bool have_context) {
+  subscriptions_.clear();
+}
+
+void UniformSubscriptionManager::AddSubscription(GLenum target,
+                                                 const GLchar* name) {
+  subscriptions_[target] = name;
+}
+
+void UniformSubscriptionManager::RemoveSubscription(GLenum target) {
+  subscriptions_.erase(target);
+}
+
+}  // namespace gles2
+}  // namespace gpu