Allow ui::Compositor to disable commits during tab-switch

ui/compositor/compositor_unittest.cc

+// Copyright 2015 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 "base/test/test_simple_task_runner.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/compositor/compositor.h"
+#include "ui/compositor/test/context_factories_for_test.h"
+
+namespace ui {
+namespace {
+
+// Test fixture for tests that require a ui::Compositor with a real task
+// runner.
+class CompositorTest : public testing::Test {
+ public:
+  CompositorTest() {}
+  ~CompositorTest() override {}
+
+  void SetUp() override {
+    task_runner_ = new base::TestSimpleTaskRunner;
+
+    ui::ContextFactory* context_factory =
+        ui::InitializeContextFactoryForTests(false);
+
+    compositor_.reset(new ui::Compositor(gfx::kNullAcceleratedWidget,
+                                         context_factory, task_runner_));
+  }
+  void TearDown() override {
+    compositor_.reset();
+    ui::TerminateContextFactoryForTests();
+  }
+
+ protected:
+  base::TestSimpleTaskRunner* task_runner() { return task_runner_.get(); }
+  ui::Compositor* compositor() { return compositor_.get(); }
+
+ private:
+  scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
+  scoped_ptr<ui::Compositor> compositor_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompositorTest);
+};
+
+}  // namespace
+
+TEST_F(CompositorTest, LocksTimeOut) {
+  scoped_refptr<ui::CompositorLock> lock;
+
+  // Ensure that the lock times out by default.
+  lock = compositor()->GetCompositorLock();
+  EXPECT_TRUE(compositor()->IsLocked());
+  task_runner()->RunUntilIdle();
+  EXPECT_FALSE(compositor()->IsLocked());
+
+  // Ensure that the lock does not time out when set.
+  compositor()->SetLocksWillTimeOut(false);
+  lock = compositor()->GetCompositorLock();
+  EXPECT_TRUE(compositor()->IsLocked());
+  task_runner()->RunUntilIdle();
+  EXPECT_TRUE(compositor()->IsLocked());
+}
+
+}  // namespace ui