cc: Remove all blimp code from cc.

cc/blimp/synced_property_remote.h

-// 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 CC_BLIMP_SYNCED_PROPERTY_REMOTE_H_
-#define CC_BLIMP_SYNCED_PROPERTY_REMOTE_H_
-
-#include "cc/base/synced_property.h"
-
-namespace cc {
-
-// This class is heavily inspired from SyncedProperty and is the equivalent of
-// SyncedProperty for synchronizing state between the engine and client in
-// remote mode. There are effectively 2 trees on the main thread, the LayerTree
-// on the main thread on the engine, and the tree on the main thread on the
-// client.
-//
-// The client main thread tree receives deltas from the impl thread, but must
-// synchronize them with the engine main thread before applying them onto the
-// the main thread associated state. At the same time there are different sets
-// of deltas, the value that was received from the impl thread but has not yet
-// been reported to the engine main thread, and the value that has been sent
-// to the engine main thread, but a state update with the application of these
-// deltas has not been received from the engine. The purpose of this class is to
-// track these deltas for deciding what needs to be reported to the main thread
-// on the engine, and providing the impl thread with the delta that it should
-// apply to its associated state since it could not be reflected in the local
-// BeginMainFrame on the client main thread.
-//
-// Instances of this class are held on the client main thread and have a 1:1
-// mapping with their corresponding SyncedProperty instances.
-
-// Note: This class currently supports only one set of deltas to be in flight to
-// the engine.
-template <typename T>
-class SyncedPropertyRemote {
- public:
-  SyncedPropertyRemote() = default;
-
-  SyncedPropertyRemote(SyncedPropertyRemote&& other) = default;
-
-  SyncedPropertyRemote& operator=(SyncedPropertyRemote&& other) = default;
-
-  // Push the main thread state from the engine onto the client main thread
-  // associated state.
-  void PushFromEngineMainThread(
-      typename T::ValueType engine_main_thread_value) {
-    engine_main_base_ = T(engine_main_thread_value);
-  }
-
-  // Called when an update for changes made on the impl thread was received on
-  // the client main thread.
-  // |main_thread_value| holds the updated value on the client main thread.
-  void UpdateDeltaFromImplThread(typename T::ValueType main_thread_value) {
-    T delta_from_impl_thread =
-        T(main_thread_value).InverseCombine(engine_main_base_);
-    unsent_delta_from_impl_thread_ =
-        unsent_delta_from_impl_thread_.Combine(delta_from_impl_thread);
-  }
-
-  // Pull deltas for changes tracked on the client main thread to be sent to the
-  // engine main thread.
-  // Each call to this must be followed with a call to DidApplySentDeltaOnEngine
-  // before another set of deltas can be pulled.
-  typename T::ValueType PullDeltaForEngineUpdate() {
-    DCHECK(sent_but_unapplied_delta_from_impl_thread_.get() ==
-           T::Identity().get());
-
-    T delta_to_send = unsent_delta_from_impl_thread_;
-    sent_but_unapplied_delta_from_impl_thread_ = delta_to_send;
-    unsent_delta_from_impl_thread_ = T::Identity();
-    return delta_to_send.get();
-  }
-
-  // Called when deltas sent to the engine were applied to the main thread state
-  // on the engine.
-  void DidApplySentDeltaOnEngine() {
-    // Pre-emptively apply the deltas that were sent. This is necessary since
-    // the engine may not send a frame update if the deltas were simply
-    // reflected back by the engine main thread (equivalent to
-    // BeginMainFrameAborted between the main and impl thread).
-    // If the engine did send a frame, we expect the frame to come with the ack
-    // for the deltas, so the value will be over-written with the engine update
-    // before being pushed to the impl thread.
-    engine_main_base_ =
-        engine_main_base_.Combine(sent_but_unapplied_delta_from_impl_thread_);
-    sent_but_unapplied_delta_from_impl_thread_ = T::Identity();
-  }
-
-  // Returns the delta that was reported to the main thread on the client but
-  // has not yet been applied to the main thread on the engine.
-  typename T::ValueType DeltaNotAppliedOnEngine() {
-    T total_delta_on_client = unsent_delta_from_impl_thread_.Combine(
-        sent_but_unapplied_delta_from_impl_thread_);
-    return total_delta_on_client.get();
-  }
-
-  typename T::ValueType EngineMain() { return engine_main_base_.get(); }
-
- private:
-  // The delta that was applied to the state on the impl thread and received on
-  // the main thread on the client during BeginMainFrame, but has not yet been
-  // reported to the main thread on the engine.
-  T unsent_delta_from_impl_thread_;
-
-  // The delta that was applied to the state on the impl thread and has been
-  // sent to the main thread on the engine, but has not yet been applied to the
-  // main thread on the engine.
-  T sent_but_unapplied_delta_from_impl_thread_;
-
-  // The value as last received from the main thread on the engine. The value on
-  // the main thread state on the client should always be set to this value,
-  // outside of the interval when deltas from the impl thread are reported to
-  // the main thread on the client.
-  T engine_main_base_;
-
-  DISALLOW_COPY_AND_ASSIGN(SyncedPropertyRemote);
-};
-
-}  // namespace cc
-
-#endif  // CC_BLIMP_SYNCED_PROPERTY_REMOTE_H_