Add DisplayCompositorTest.

services/ui/surfaces/display_compositor_unittest.cc

Index: services/ui/surfaces/display_compositor_unittest.cc
diff --git a/services/ui/surfaces/display_compositor_unittest.cc b/services/ui/surfaces/display_compositor_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c1980f88b168201465c180cb0c5c0159dc5d3071
--- /dev/null
+++ b/services/ui/surfaces/display_compositor_unittest.cc
@@ -0,0 +1,266 @@
+// 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 "services/ui/surfaces/display_compositor.h"
+
+#include <inttypes.h>
+
+#include <string>
+#include <utility>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/stringprintf.h"
+#include "cc/ipc/display_compositor.mojom.h"
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_observer.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "services/ui/common/task_runner_test_base.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace ui {
+namespace test {
+namespace {
+
+std::string SurfaceIdString(const cc::SurfaceId& surface_id) {
+  return base::StringPrintf("%u:%u:%u", surface_id.frame_sink_id().client_id(),
+                            surface_id.frame_sink_id().sink_id(),
+                            surface_id.local_frame_id().local_id());
+}
+
+cc::SurfaceId MakeSurfaceId(uint32_t client_id,
+                            uint32_t sink_id,
+                            uint32_t local_id) {
+  return cc::SurfaceId(
+      cc::FrameSinkId(client_id, sink_id),
+      cc::LocalFrameId(local_id, base::UnguessableToken::Deserialize(0, 1u)));
+}
+
+// Test mojom::DisplayCompositorClient that records OnSurfaceCreated() events.
+class TestDisplayCompositorClient : public cc::mojom::DisplayCompositorClient {
+ public:
+  TestDisplayCompositorClient() : binding_(this) {}
+  ~TestDisplayCompositorClient() override {}
+
+  cc::mojom::DisplayCompositorClientPtr GetPtr() {
+    return binding_.CreateInterfacePtrAndBind();
+  }
+
+  // Returns events that have occurred and clear.
+  std::string events() {
+    std::string value = std::move(events_);
+    events_.clear();
+    return value;
+  }
+
+ private:
+  void AddEvent(const std::string& text) {
+    if (!events_.empty())
+      events_ += ";";
+    events_ += text;
+  }
+
+  // cc::mojom::DisplayCompositorClient:
+  void OnSurfaceCreated(const cc::SurfaceId& surface_id,
+                        const gfx::Size& frame_size,
+                        float device_scale_factor) override {
+    AddEvent(base::StringPrintf("OnSurfaceCreated(%s)",
+                                SurfaceIdString(surface_id).c_str()));
+  }
+
+  mojo::Binding<cc::mojom::DisplayCompositorClient> binding_;
+  std::string events_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestDisplayCompositorClient);
+};
+
+// Test SurfaceReferenceManager that records AddSurfaceReference() and
+// RemoveSurfaceReference() events.
+class TestSurfaceReferenceManager : public cc::SurfaceReferenceManager {
+ public:
+  ~TestSurfaceReferenceManager() override {}
+
+  const cc::SurfaceId& GetRootSurfaceId() const override { return root_id_; }
+
+  void AddSurfaceReference(const cc::SurfaceId& parent_id,
+                           const cc::SurfaceId& child_id) override {
+    AddEvent(base::StringPrintf("Add(%s-%s)",
+                                SurfaceIdString(parent_id).c_str(),
+                                SurfaceIdString(child_id).c_str()));
+  }
+
+  void RemoveSurfaceReference(const cc::SurfaceId& parent_id,
+                              const cc::SurfaceId& child_id) override {
+    AddEvent(base::StringPrintf("Remove(%s-%s)",
+                                SurfaceIdString(parent_id).c_str(),
+                                SurfaceIdString(child_id).c_str()));
+  }
+
+  size_t GetSurfaceReferenceCount(
+      const cc::SurfaceId& surface_id) const override {
+    NOTREACHED();
+    return 0;
+  }
+
+  size_t GetReferencedSurfaceCount(
+      const cc::SurfaceId& surface_id) const override {
+    NOTREACHED();
+    return 0;
+  }
+
+  // Returns events that have occurred and clear.
+  std::string events() {
+    std::string value = std::move(events_);
+    events_.clear();
+    return value;
+  }
+
+ private:
+  void AddEvent(const std::string& text) {
+    if (!events_.empty())
+      events_ += ";";
+    events_ += text;
+  }
+
+  const cc::SurfaceId root_id_ = MakeSurfaceId(0, 0, 0);
+  std::string events_;
+};
+
+}  // namespace
+
+class DisplayCompositorTest : public TaskRunnerTestBase {
+ public:
+  DisplayCompositorTest() {}
+  ~DisplayCompositorTest() override {}
+
+  cc::SurfaceObserver* surface_observer() { return display_compositor_.get(); }
+
+  // Returns the total number of temporary references held by DisplayCompositor.
+  size_t CountTempReferences() {
+    size_t size = 0;
+    for (auto& map_entry : display_compositor_->temp_references_) {
+      size += map_entry.second.size();
+    }
+    return size;
+  }
+
+  // TaskRunnerTestBase:
+  void SetUp() override {
+    TaskRunnerTestBase::SetUp();
+    display_compositor_ = base::MakeUnique<DisplayCompositor>(
+        nullptr, nullptr, nullptr, nullptr, client_.GetPtr());
+    display_compositor_->reference_manager_ = &reference_manager_;
+  }
+
+  void TearDown() override {
+    // Clear any events before the next test.
+    client_.events();
+    reference_manager_.events();
+  }
+
+ protected:
+  TestDisplayCompositorClient client_;
+  TestSurfaceReferenceManager reference_manager_;
+  std::unique_ptr<DisplayCompositor> display_compositor_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayCompositorTest);
+};
+
+TEST_F(DisplayCompositorTest, AddSurfaceThenReference) {
+  const cc::SurfaceId parent_id = MakeSurfaceId(1, 1, 1);
+  const cc::SurfaceId surface_id = MakeSurfaceId(2, 1, 1);
+  surface_observer()->OnSurfaceCreated(surface_id, gfx::Size(1, 1), 1.0f);
+  RunUntilIdle();
+
+  // Client should get OnSurfaceCreated call and temporary reference added.
+  EXPECT_EQ("OnSurfaceCreated(2:1:1)", client_.events());
+  EXPECT_EQ("Add(0:0:0-2:1:1)", reference_manager_.events());
+  EXPECT_EQ(1u, CountTempReferences());
+
+  display_compositor_->AddSurfaceReference(parent_id, surface_id);
+  RunUntilIdle();
+
+  // Real reference is added then temporary reference removed.
+  EXPECT_EQ("Add(1:1:1-2:1:1);Remove(0:0:0-2:1:1)",
+            reference_manager_.events());
+  EXPECT_EQ(0u, CountTempReferences());
+}
+
+TEST_F(DisplayCompositorTest, AddSurfaceThenRootReference) {
+  const cc::SurfaceId surface_id = MakeSurfaceId(1, 1, 1);
+  surface_observer()->OnSurfaceCreated(surface_id, gfx::Size(1, 1), 1.0f);
+  RunUntilIdle();
+
+  // Temporary reference should be added.
+  EXPECT_EQ("Add(0:0:0-1:1:1)", reference_manager_.events());
+  EXPECT_EQ(1u, CountTempReferences());
+
+  display_compositor_->AddRootSurfaceReference(surface_id);
+  RunUntilIdle();
+
+  // Adding real reference doesn't need to change anything in
+  // SurfaceReferenceManager does remove the temporary reference marker.
+  EXPECT_EQ("", reference_manager_.events());
+  EXPECT_EQ(0u, CountTempReferences());
+}
+
+TEST_F(DisplayCompositorTest, AddTwoSurfacesThenOneReference) {
+  const cc::SurfaceId parent_id = MakeSurfaceId(1, 1, 1);
+  const cc::SurfaceId surface_id1 = MakeSurfaceId(2, 1, 1);
+  const cc::SurfaceId surface_id2 = MakeSurfaceId(3, 1, 1);
+
+  // Add two surfaces with different FrameSinkIds.
+  surface_observer()->OnSurfaceCreated(surface_id1, gfx::Size(1, 1), 1.0f);
+  surface_observer()->OnSurfaceCreated(surface_id2, gfx::Size(1, 1), 1.0f);
+  RunUntilIdle();
+
+  // Temporary reference should be added for both surfaces.
+  EXPECT_EQ("Add(0:0:0-2:1:1);Add(0:0:0-3:1:1)", reference_manager_.events());
+  EXPECT_EQ(2u, CountTempReferences());
+
+  display_compositor_->AddSurfaceReference(parent_id, surface_id1);
+  RunUntilIdle();
+
+  // Real reference is added then temporary reference removed for 2:1:1. There
+  // should still be a temporary reference left to 3:1:1
+  EXPECT_EQ("Add(1:1:1-2:1:1);Remove(0:0:0-2:1:1)",
+            reference_manager_.events());
+  EXPECT_EQ(1u, CountTempReferences());
+}
+
+TEST_F(DisplayCompositorTest, AddSurfacesSkipReference) {
+  const cc::SurfaceId parent_id = MakeSurfaceId(1, 1, 1);
+  const cc::SurfaceId surface_id1 = MakeSurfaceId(2, 1, 1);
+  const cc::SurfaceId surface_id2 = MakeSurfaceId(2, 1, 2);
+
+  // Add two surfaces that have the same FrameSinkId. This would happen when a
+  // client submits two CFs before parent submits a new CF.
+  surface_observer()->OnSurfaceCreated(surface_id1, gfx::Size(1, 1), 1.0f);
+  surface_observer()->OnSurfaceCreated(surface_id2, gfx::Size(1, 1), 1.0f);
+  RunUntilIdle();
+
+  // Client should get OnSurfaceCreated call and temporary reference added for
+  // both surfaces.
+  EXPECT_EQ("OnSurfaceCreated(2:1:1);OnSurfaceCreated(2:1:2)",
+            client_.events());
+  EXPECT_EQ("Add(0:0:0-2:1:1);Add(0:0:0-2:1:2)", reference_manager_.events());
+  EXPECT_EQ(2u, CountTempReferences());
+
+  // Add a reference to the surface with the later LocalFrameId.
+  display_compositor_->AddSurfaceReference(parent_id, surface_id2);
+  RunUntilIdle();
+
+  // The real reference should be added for 2:1:2 and both temporary references
+  // should be removed.
+  EXPECT_EQ("Add(1:1:1-2:1:2);Remove(0:0:0-2:1:2);Remove(0:0:0-2:1:1)",
+            reference_manager_.events());
+  EXPECT_EQ(0u, CountTempReferences());
+}
+
+}  // namespace test
+}  // namespace ui