cc: Plumbing for BeginFrameSource based on Surfaces

cc/surfaces/surface_unittest.cc

 // Copyright 2014 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/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
+#include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_manager.h"
+#include "cc/test/scheduler_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 namespace {
 
+class FakeSurfaceFactoryClient : public SurfaceFactoryClient {
+ public:
+  FakeSurfaceFactoryClient() : begin_frame_source_(nullptr) {}
+
+  void ReturnResources(const ReturnedResourceArray& resources) override {}
+
+  void SetBeginFrameSource(BeginFrameSource* begin_frame_source) override {
+    begin_frame_source_ = begin_frame_source;
+  }
+
+  BeginFrameSource* begin_frame_source() { return begin_frame_source_; }
+
+ private:
+  BeginFrameSource* begin_frame_source_;
+};
+
 TEST(SurfaceTest, SurfaceLifetime) {
   SurfaceManager manager;
-  SurfaceFactory factory(&manager, NULL);
+  FakeSurfaceFactoryClient surface_factory_client;
+  SurfaceFactory factory(&manager, &surface_factory_client);
 
   SurfaceId surface_id(6);
   {
     factory.Create(surface_id);
     EXPECT_TRUE(manager.GetSurfaceForId(surface_id));
     factory.Destroy(surface_id);
   }
 
   EXPECT_EQ(NULL, manager.GetSurfaceForId(surface_id));
 }
 
+TEST(SurfaceTest, StableBeginFrameSourceIndependentOfOrderAdded) {
+  SurfaceManager manager;
+  FakeSurfaceFactoryClient surface_factory_client;
+  SurfaceFactory factory(&manager, &surface_factory_client);
+
+  SurfaceId surface_id(6);
+  factory.Create(surface_id);
+  Surface* surface = manager.GetSurfaceForId(surface_id);
+
+  FakeBeginFrameSource bfs1;
+  FakeBeginFrameSource bfs2;
+  FakeBeginFrameSource bfs3;
+
+  // Order 1.
+  surface->AddBeginFrameSource(&bfs1);
+  surface->AddBeginFrameSource(&bfs2);
+  surface->AddBeginFrameSource(&bfs3);
+  BeginFrameSource* bfs_order1 = surface_factory_client.begin_frame_source();
+  // Make sure one of the provided sources was chosen.
+  EXPECT_TRUE(&bfs1 == bfs_order1 || &bfs2 == bfs_order1 ||
+              &bfs3 == bfs_order1);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+
+  // Order 2.
+  surface->AddBeginFrameSource(&bfs1);
+  surface->AddBeginFrameSource(&bfs3);
+  surface->AddBeginFrameSource(&bfs2);
+  BeginFrameSource* bfs_order2 = surface_factory_client.begin_frame_source();
+  // Verify choice is same as before.
+  EXPECT_EQ(bfs_order1, bfs_order2);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+
+  // Order 3.
+  surface->AddBeginFrameSource(&bfs2);
+  surface->AddBeginFrameSource(&bfs1);
+  surface->AddBeginFrameSource(&bfs3);
+  BeginFrameSource* bfs_order3 = surface_factory_client.begin_frame_source();
+  // Verify choice is same as before.
+  EXPECT_EQ(bfs_order2, bfs_order3);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+
+  // Order 4.
+  surface->AddBeginFrameSource(&bfs2);
+  surface->AddBeginFrameSource(&bfs3);
+  surface->AddBeginFrameSource(&bfs1);
+  BeginFrameSource* bfs_order4 = surface_factory_client.begin_frame_source();
+  // Verify choice is same as before.
+  EXPECT_EQ(bfs_order3, bfs_order4);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+
+  // Order 5.
+  surface->AddBeginFrameSource(&bfs3);
+  surface->AddBeginFrameSource(&bfs1);
+  surface->AddBeginFrameSource(&bfs2);
+  BeginFrameSource* bfs_order5 = surface_factory_client.begin_frame_source();
+  // Verify choice is same as before.
+  EXPECT_EQ(bfs_order4, bfs_order5);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+
+  // Order 6.
+  surface->AddBeginFrameSource(&bfs3);
+  surface->AddBeginFrameSource(&bfs2);
+  surface->AddBeginFrameSource(&bfs1);
+  BeginFrameSource* bfs_order6 = surface_factory_client.begin_frame_source();
+  // Verify choice is same as before.
+  EXPECT_EQ(bfs_order5, bfs_order6);
+  surface->RemoveBeginFrameSource(&bfs1);
+  surface->RemoveBeginFrameSource(&bfs2);
+  surface->RemoveBeginFrameSource(&bfs3);
+  EXPECT_EQ(nullptr, surface_factory_client.begin_frame_source());
+}
+
+TEST(SurfaceTest, BeginFrameSourceRemovedOnSurfaceDestruction) {
+  SurfaceManager manager;
+  FakeSurfaceFactoryClient surface_factory_client;
+  SurfaceFactory factory(&manager, &surface_factory_client);
+  FakeBeginFrameSource bfs;
+
+  SurfaceId surface_id(6);
+  factory.Create(surface_id);
+  Surface* surface = manager.GetSurfaceForId(surface_id);
+  surface->AddBeginFrameSource(&bfs);
+
+  BeginFrameSource* bfs_before = surface_factory_client.begin_frame_source();
+  factory.Destroy(surface_id);
+  BeginFrameSource* bfs_after = surface_factory_client.begin_frame_source();
+
+  EXPECT_EQ(&bfs, bfs_before);
+  EXPECT_EQ(nullptr, bfs_after);
+}
+
 }  // namespace
 }  // namespace cc