Create manager to track OffscreenCanvasSurfaceImpl instances

content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc

Index: content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc b/content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ef85a713fa459cf9f08592c70e62cd9dc8387b80
--- /dev/null
+++ b/content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc
@@ -0,0 +1,128 @@
+// Copyright (c) 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 "content/browser/compositor/test/no_transport_image_transport_factory.h"
+#include "content/browser/renderer_host/offscreen_canvas_surface_impl.h"
+#include "content/browser/renderer_host/offscreen_canvas_surface_manager.h"
+#include "content/public/test/test_browser_thread.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_ANDROID)
+#include "content/browser/renderer_host/context_provider_factory_impl_android.h"
+#include "content/test/mock_gpu_channel_establish_factory.h"
+#else
+#include "content/browser/compositor/image_transport_factory.h"
+#endif
+
+namespace content {
+
+class OffscreenCanvasSurfaceManagerTest : public testing::Test {
+ public:
+  int getNumSurfaceImplInstances() {
+    return OffscreenCanvasSurfaceManager::GetInstance()
+        ->registered_surface_instances_.size();
+  }
+  const cc::SurfaceId& getCurrentSurfaceId() const {
+    return current_surface_id_;
+  }
+  void setSurfaceId(const cc::SurfaceId& surface_id) {
+    current_surface_id_ = surface_id;
+  }
+
+ protected:
+  void SetUp() override;
+  void TearDown() override;
+
+ private:
+  cc::SurfaceId current_surface_id_;
+  std::unique_ptr<TestBrowserThread> ui_thread_;
+  base::MessageLoopForUI message_loop_;
+#if defined(OS_ANDROID)
+  MockGpuChannelEstablishFactory gpu_channel_factory_;
+#endif
+};
+
+void OffscreenCanvasSurfaceManagerTest::SetUp() {
+#if defined(OS_ANDROID)
+  ContextProviderFactoryImpl::Initialize(&gpu_channel_factory_);
+  ui::ContextProviderFactory::SetInstance(
+      ContextProviderFactoryImpl::GetInstance());
+#else
+  ImageTransportFactory::InitializeForUnitTests(
+      std::unique_ptr<ImageTransportFactory>(
+          new NoTransportImageTransportFactory));
+#endif
+  ui_thread_.reset(new TestBrowserThread(BrowserThread::UI, &message_loop_));
+}
+
+void OffscreenCanvasSurfaceManagerTest::TearDown() {
+#if defined(OS_ANDROID)
+  ui::ContextProviderFactory::SetInstance(nullptr);
+  ContextProviderFactoryImpl::Terminate();
+#else
+  ImageTransportFactory::Terminate();
+#endif
+}
+
+// This test mimics the workflow of OffscreenCanvas.commit() on renderer
+// process.
+TEST_F(OffscreenCanvasSurfaceManagerTest,
+       SingleHTMLCanvasElementTransferToOffscreen) {
+  // Assume that HTMLCanvasElement.transferControlToOffscreen() is triggered and
+  // it will invoke GetSurfaceId function on OffscreenCanvasSurfaceImpl to
+  // obtain a unique SurfaceId from browser.
+  auto surface_impl = base::WrapUnique(new OffscreenCanvasSurfaceImpl());
+  surface_impl->GetSurfaceId(
+      base::Bind(&OffscreenCanvasSurfaceManagerTest::setSurfaceId,
+                 base::Unretained(this)));
+
+  EXPECT_TRUE(this->getCurrentSurfaceId().is_valid());
+  EXPECT_EQ(1, this->getNumSurfaceImplInstances());
+  cc::FrameSinkId frame_sink_id = surface_impl.get()->frame_sink_id();
+  EXPECT_EQ(frame_sink_id, this->getCurrentSurfaceId().frame_sink_id());
+  EXPECT_EQ(surface_impl.get(),
+            OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
+                frame_sink_id));
+
+  surface_impl = nullptr;
+  EXPECT_EQ(0, this->getNumSurfaceImplInstances());
+}
+
+TEST_F(OffscreenCanvasSurfaceManagerTest,
+       MultiHTMLCanvasElementTransferToOffscreen) {
+  // Same scenario as above test except that now we have two HTMLCanvasElement
+  // transferControlToOffscreen at the same time.
+  auto surface_impl_a = base::WrapUnique(new OffscreenCanvasSurfaceImpl());
+  surface_impl_a->GetSurfaceId(
+      base::Bind(&OffscreenCanvasSurfaceManagerTest::setSurfaceId,
+                 base::Unretained(this)));
+  cc::SurfaceId surface_id_a = this->getCurrentSurfaceId();
+
+  EXPECT_TRUE(surface_id_a.is_valid());
+
+  auto surface_impl_b = base::WrapUnique(new OffscreenCanvasSurfaceImpl());
+  surface_impl_b->GetSurfaceId(
+      base::Bind(&OffscreenCanvasSurfaceManagerTest::setSurfaceId,
+                 base::Unretained(this)));
+  cc::SurfaceId surface_id_b = this->getCurrentSurfaceId();
+
+  EXPECT_TRUE(surface_id_b.is_valid());
+  EXPECT_NE(surface_id_a, surface_id_b);
+
+  EXPECT_EQ(2, this->getNumSurfaceImplInstances());
+  EXPECT_EQ(surface_impl_a.get(),
+            OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
+                surface_id_a.frame_sink_id()));
+  EXPECT_EQ(surface_impl_b.get(),
+            OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
+                surface_id_b.frame_sink_id()));
+
+  surface_impl_a = nullptr;
+  EXPECT_EQ(1, this->getNumSurfaceImplInstances());
+  surface_impl_b = nullptr;
+  EXPECT_EQ(0, this->getNumSurfaceImplInstances());
+}
+
+}  // namespace content