compositor-worker: cc->blink mutation plumbing

third_party/WebKit/Source/platform/graphics/CompositorMutatorClientTest.cpp

+// 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 "platform/graphics/CompositorMutatorClient.h"
+
+#include "base/callback.h"
+#include "platform/graphics/CompositorMutation.h"
+#include "platform/graphics/CompositorMutationsTarget.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/OwnPtr.h"
+
+using ::testing::_;
+
+namespace blink {
+namespace {
+
+class MockCompositoMutationsTarget : public CompositorMutationsTarget {
+public:
+    MOCK_METHOD1(applyMutations, void(CompositorMutations*));
+};
+
+TEST(CompositorMutatorClient, CallbackForNonNullMutationsShouldApply)
+{
+    MockCompositoMutationsTarget target;
+
+    CompositorMutatorClient client(&target);
+    OwnPtr<CompositorMutations> mutations = adoptPtr(new CompositorMutations());
+    client.setMutationsForTesting(mutations.release());
+
+    EXPECT_CALL(target, applyMutations(_));
+    client.TakeMutations().Run();
+}
+
+TEST(CompositorMutatorClient, CallbackForNullMutationsShouldBeNoop)
+{
+    MockCompositoMutationsTarget target;
+    CompositorMutatorClient client(&target);
+
+    EXPECT_CALL(target, applyMutations(_)).Times(0);
+    EXPECT_TRUE(client.TakeMutations().is_null());
+}
+
+} // namespace
+} // namespace blink