Update from https://crrev.com/304121

gpu/command_buffer/service/valuebuffer_manager.cc

Index: gpu/command_buffer/service/valuebuffer_manager.cc
diff --git a/gpu/command_buffer/service/valuebuffer_manager.cc b/gpu/command_buffer/service/valuebuffer_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eb4db093f70211d15af73cc3531979480ae6d33d
--- /dev/null
+++ b/gpu/command_buffer/service/valuebuffer_manager.cc
@@ -0,0 +1,117 @@
+// 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/valuebuffer_manager.h"
+
+#include "gpu/command_buffer/service/program_manager.h"
+
+namespace gpu {
+namespace gles2 {
+
+Valuebuffer::Valuebuffer(ValuebufferManager* manager, GLuint client_id)
+    : manager_(manager), client_id_(client_id), has_been_bound_(false) {
+  manager_->StartTracking(this);
+}
+
+Valuebuffer::~Valuebuffer() {
+  if (manager_) {
+    manager_->StopTracking(this);
+    manager_ = NULL;
+  }
+}
+
+void Valuebuffer::AddSubscription(GLenum subscription) {
+  subscriptions_.insert(subscription);
+}
+
+void Valuebuffer::RemoveSubscription(GLenum subscription) {
+  subscriptions_.erase(subscription);
+}
+
+bool Valuebuffer::IsSubscribed(GLenum subscription) {
+  return subscriptions_.find(subscription) != subscriptions_.end();
+}
+
+const ValueState *Valuebuffer::GetState(GLenum target) const {
+  StateMap::const_iterator it = active_state_map_.find(target);
+  return it != active_state_map_.end() ? &it->second : NULL;
+}
+
+void Valuebuffer::UpdateState(const StateMap& pending_state) {
+  for (SubscriptionSet::const_iterator it = subscriptions_.begin();
+       it != subscriptions_.end(); ++it) {
+    StateMap::const_iterator pending_state_it = pending_state.find((*it));
+    if (pending_state_it != pending_state.end()) {
+      active_state_map_[pending_state_it->first] = pending_state_it->second;
+    }
+  }
+}
+
+ValuebufferManager::ValuebufferManager()
+    : valuebuffer_count_(0) {
+}
+
+ValuebufferManager::~ValuebufferManager() {
+  DCHECK(valuebuffer_map_.empty());
+  DCHECK(pending_state_map_.empty());
+  // If this triggers, that means something is keeping a reference to
+  // a Valuebuffer belonging to this.
+  CHECK_EQ(valuebuffer_count_, 0u);
+}
+
+void ValuebufferManager::Destroy() {
+  valuebuffer_map_.clear();
+  pending_state_map_.clear();
+}
+
+void ValuebufferManager::StartTracking(Valuebuffer* /* valuebuffer */) {
+  ++valuebuffer_count_;
+}
+
+void ValuebufferManager::StopTracking(Valuebuffer* /* valuebuffer */) {
+  --valuebuffer_count_;
+}
+
+void ValuebufferManager::CreateValuebuffer(GLuint client_id) {
+  scoped_refptr<Valuebuffer> valuebuffer(new Valuebuffer(this, client_id));
+  std::pair<ValuebufferMap::iterator, bool> result =
+      valuebuffer_map_.insert(std::make_pair(client_id, valuebuffer));
+  DCHECK(result.second);
+}
+
+Valuebuffer* ValuebufferManager::GetValuebuffer(GLuint client_id) {
+  ValuebufferMap::iterator it = valuebuffer_map_.find(client_id);
+  return it != valuebuffer_map_.end() ? it->second.get() : NULL;
+}
+
+void ValuebufferManager::RemoveValuebuffer(GLuint client_id) {
+  ValuebufferMap::iterator it = valuebuffer_map_.find(client_id);
+  if (it != valuebuffer_map_.end()) {
+    Valuebuffer* valuebuffer = it->second.get();
+    valuebuffer->MarkAsDeleted();
+    valuebuffer_map_.erase(it);
+  }
+}
+
+void ValuebufferManager::UpdateValuebufferState(Valuebuffer* valuebuffer) {
+  DCHECK(valuebuffer);
+  valuebuffer->UpdateState(pending_state_map_);
+}
+
+void ValuebufferManager::UpdateValueState(
+    GLenum target, const ValueState& state) {
+  pending_state_map_[target] = state;
+}
+
+uint32 ValuebufferManager::ApiTypeForSubscriptionTarget(GLenum target) {
+  switch (target) {
+    case GL_MOUSE_POSITION_CHROMIUM:
+      return Program::kUniform2i;
+  }
+  NOTREACHED() << "Unhandled uniform subscription target " << target;
+  return Program::kUniformNone;
+}
+
+}  // namespace gles2
+}  // namespace gpu