cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/trees/swap_promise_manager_unittest.cc

+// 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.
+
+#include "cc/trees/swap_promise_manager.h"
+
+#include "base/memory/ptr_util.h"
+#include "cc/trees/swap_promise_monitor.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::StrictMock;
+
+namespace cc {
+namespace {
+
+class MockSwapPromiseMonitor : public SwapPromiseMonitor {
+ public:
+  explicit MockSwapPromiseMonitor(SwapPromiseManager* manager)
+      : SwapPromiseMonitor(manager, nullptr) {}
+  ~MockSwapPromiseMonitor() override {}
+
+  MOCK_METHOD0(OnSetNeedsCommitOnMain, void());
+  void OnSetNeedsRedrawOnImpl() override {}
+  void OnForwardScrollUpdateToMainThreadOnImpl() override {}
+};
+
+class MockSwapPromise : public SwapPromise {
+ public:
+  MockSwapPromise() {}
+  ~MockSwapPromise() override {}
+
+  void DidActivate() override {}
+  void DidSwap(CompositorFrameMetadata* metadata) override {}
+  DidNotSwapAction DidNotSwap(DidNotSwapReason reason) override {
+    return DidNotSwapAction::BREAK_PROMISE;
+  }
+  MOCK_METHOD0(OnCommit, void());
+  int64_t TraceId() const override { return 0; }
+};
+
+TEST(SwapPromiseManagerTest, SwapPromiseMonitors) {
+  SwapPromiseManager manager;
+  StrictMock<MockSwapPromiseMonitor> monitor(&manager);
+
+  EXPECT_CALL(monitor, OnSetNeedsCommitOnMain()).Times(2);
+
+  manager.NotifySwapPromiseMonitorsOfSetNeedsCommit();
+  manager.NotifySwapPromiseMonitorsOfSetNeedsCommit();
+}
+
+TEST(SwapPromiseManagerTest, SwapPromises) {
+  SwapPromiseManager manager;
+  std::unique_ptr<StrictMock<MockSwapPromise>> swap_promise =
+      base::MakeUnique<StrictMock<MockSwapPromise>>();
+  MockSwapPromise* mock_promise = swap_promise.get();
+
+  manager.QueueSwapPromise(std::move(swap_promise));
+
+  EXPECT_CALL(*mock_promise, OnCommit()).Times(1);
+  manager.WillCommit();
+
+  std::vector<std::unique_ptr<SwapPromise>> swap_promise_list =
+      manager.TakeSwapPromises();
+  // Now that we've taken the promises, this shouldn't trigger a call.
+  manager.WillCommit();
+
+  EXPECT_EQ(1, static_cast<int>(swap_promise_list.size()));
+}
+
+}  // namespace
+}  // namespace cc