cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/layer_tree_host_unittest_context.cc

+// Copyright 2012 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/layer_tree_host.h"
+
+#include "base/basictypes.h"
+#include "cc/content_layer.h"
+#include "cc/delegated_renderer_layer.h"
+#include "cc/delegated_renderer_layer_impl.h"
+#include "cc/heads_up_display_layer.h"
+#include "cc/io_surface_layer.h"
+#include "cc/layer_impl.h"
+#include "cc/layer_tree_host_impl.h"
+#include "cc/layer_tree_impl.h"
+#include "cc/scrollbar_layer.h"
+#include "cc/single_thread_proxy.h"
+#include "cc/test/fake_content_layer.h"
+#include "cc/test/fake_content_layer_client.h"
+#include "cc/test/fake_content_layer_impl.h"
+#include "cc/test/fake_output_surface.h"
+#include "cc/test/fake_scrollbar_theme_painter.h"
+#include "cc/test/fake_video_frame.h"
+#include "cc/test/fake_video_frame_provider.h"
+#include "cc/test/fake_web_graphics_context_3d.h"
+#include "cc/test/fake_web_scrollbar.h"
+#include "cc/test/fake_web_scrollbar_theme_geometry.h"
+#include "cc/test/layer_tree_test_common.h"
+#include "cc/test/render_pass_test_common.h"
+#include "cc/texture_layer.h"
+#include "cc/video_layer.h"
+#include "cc/video_layer_impl.h"
+#include "media/base/media.h"
+
+using media::VideoFrame;
+using WebKit::WebGraphicsContext3D;
+
+namespace cc {
+namespace {
+
+// These tests deal with losing the 3d graphics context.
+class LayerTreeHostContextTest : public ThreadedTest {
+ public:
+  LayerTreeHostContextTest()
+      : ThreadedTest(),
+        context3d_(NULL),
+        times_to_fail_create_(0),
+        times_to_create_and_lose_(0),
+        times_to_lose_during_commit_(0),
+        times_to_repeat_loss_(0),
+        times_to_fail_recreate_(0) {
+    media::InitializeMediaLibraryForTesting();
+  }
+
+  void LoseContext() {
+    context3d_->loseContextCHROMIUM();
+    context3d_ = NULL;
+  }
+
+  virtual scoped_ptr<FakeWebGraphicsContext3D> CreateContext3d() {
+    return FakeWebGraphicsContext3D::Create();
+  }
+
+  virtual scoped_ptr<OutputSurface> createOutputSurface() OVERRIDE {
+    if (times_to_fail_create_) {
+      --times_to_fail_create_;
+      return scoped_ptr<OutputSurface>();
+    }
+
+    scoped_ptr<FakeWebGraphicsContext3D> context3d = CreateContext3d();
+    context3d_ = context3d.get();
+
+    if (times_to_create_and_lose_) {
+      --times_to_create_and_lose_;
+      // Make the context get lost during reinitialization.
+      // The number of times MakeCurrent succeeds is not important, and
+      // can be changed if needed to make this pass with future changes.
+      context3d_->set_times_make_current_succeeds(2);
+    }
+
+    return FakeOutputSurface::Create3d(
+        context3d.PassAs<WebGraphicsContext3D>()).PassAs<OutputSurface>();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl *host_impl) OVERRIDE {
+    if (!times_to_lose_during_commit_)
+      return;
+    --times_to_lose_during_commit_;
+    LoseContext();
+
+    times_to_create_and_lose_ = times_to_repeat_loss_;
+    times_to_repeat_loss_ = 0;
+    times_to_fail_create_ = times_to_fail_recreate_;
+    times_to_fail_recreate_ = 0;
+  }
+
+ protected:
+  FakeWebGraphicsContext3D* context3d_;
+  int times_to_fail_create_;
+  int times_to_create_and_lose_;
+  int times_to_lose_during_commit_;
+  int times_to_repeat_loss_;
+  int times_to_fail_recreate_;
+};
+
+class LayerTreeHostContextTestLostContextSucceeds :
+      public LayerTreeHostContextTest {
+ public:
+  LayerTreeHostContextTestLostContextSucceeds()
+      : LayerTreeHostContextTest(),
+        test_case_(0),
+        num_losses_(0) {
+  }
+
+  virtual void beginTest() OVERRIDE {
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void didRecreateOutputSurface(bool succeeded) OVERRIDE {
+    EXPECT_TRUE(succeeded);
+    ++num_losses_;
+  }
+
+  virtual void afterTest() OVERRIDE {
+    EXPECT_EQ(3, test_case_);
+    EXPECT_EQ(3, num_losses_);
+  }
+
+  bool SourceFrameHasContextLoss(int source_frame) const {
+    return source_frame % 2 == 1;
+  }
+
+  virtual void didCommitAndDrawFrame() OVERRIDE {
+    // If the last frame had a context loss, then we'll commit again to
+    // recover.
+    if (SourceFrameHasContextLoss(m_layerTreeHost->commitNumber()) - 1)
+      return;
+
+    if (NextTestCase())
+      m_layerTreeHost->setNeedsCommit();
+    else
+      endTest();
+  }
+
+  bool NextTestCase() {
+    static const TestCase kTests[] = {
+      // Losing the context and failing to recreate it (or losing it again
+      // immediately) a small number of times should succeed.
+      { 1, // times_to_lose_during_commit
+        0, // times_to_repeat_loss
+        0, // times_to_fail_recreate
+      },
+      { 1,
+        3, // times_to_repeat_loss
+        0, // times_to_fail_recreate
+      },
+      { 1,
+        0, // times_to_repeat_loss
+        3, // times_to_fail_recreate
+      },
+    };
+
+    if (test_case_ >= arraysize(kTests))
+      return false;
+
+    times_to_lose_during_commit_ =
+        kTests[test_case_].times_to_lose_during_commit;
+    times_to_repeat_loss_ = kTests[test_case_].times_to_repeat_loss;
+    times_to_fail_recreate_ = kTests[test_case_].times_to_fail_recreate;
+    ++test_case_;
+    return true;
+  }
+
+  struct TestCase {
+    int times_to_lose_during_commit;
+    int times_to_repeat_loss;
+    int times_to_fail_recreate;
+  };
+
+ private:
+  size_t test_case_;
+  int num_losses_;
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostContextTestLostContextSucceeds)
+
+template<bool kUseSurface>

[jamesr, 2013/01/03 22:59:07]

Why the template?  Code inside a TEST_F body is a subclass of the fixture so you
should be able to just do:

TEST_F(LayerTreeHostContextTestLostContextSucceedsWithContent, NoSurface) {
  use_surface_ = false;
  runTest(false);
}

and the same thing with

  runTest(true)

if you want to run it in threaded mode as well.  I get that you're trying to cut
down on boilerplate but I think this is optimizing for line count instead of
understandability.  Sometimes a few more lines of straightforward code is
clearer than a clever thing that shaves a few LOC

+class LayerTreeHostContextTestLostContextSucceedsWithContent :
+    public LayerTreeHostContextTestLostContextSucceeds {
+ public:
+
+  LayerTreeHostContextTestLostContextSucceedsWithContent()
+      : LayerTreeHostContextTestLostContextSucceeds() {
+  }
+
+  virtual void setupTree() OVERRIDE {
+    scoped_refptr<Layer> root_ = Layer::create();
+    root_->setBounds(gfx::Size(10, 10));
+    root_->setAnchorPoint(gfx::PointF());
+    root_->setIsDrawable(true);
+
+    scoped_refptr<FakeContentLayer> content_ =
+        FakeContentLayer::Create(&client_);
+    content_->setBounds(gfx::Size(10, 10));
+    content_->setAnchorPoint(gfx::PointF());
+    content_->setIsDrawable(true);
+    if (kUseSurface)
+      content_->setForceRenderSurface(true);
+    root_->addChild(content_);
+
+    m_layerTreeHost->setRootLayer(root_);
+    LayerTreeHostContextTest::setupTree();
+  }
+
+  virtual void drawLayersOnThread(LayerTreeHostImpl* host_impl) {
+    FakeContentLayerImpl* content_impl = static_cast<FakeContentLayerImpl*>(
+        host_impl->rootLayer()->children()[0]);
+    // Even though the context was lost, we should have a resource. The
+    // FakeWebGraphicsContext3D ensures that this resource is created with
+    // the active context.
+    EXPECT_TRUE(content_impl->HaveResourceForTileAt(0, 0));
+  }
+
+ protected:
+  FakeContentLayerClient client_;
+  scoped_refptr<Layer> root_;
+  scoped_refptr<ContentLayer> content_;
+};
+
+class LayerTreeHostContextTestLostContextSucceedsWithContent_NoSurface
+    : public LayerTreeHostContextTestLostContextSucceedsWithContent<false> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextSucceedsWithContent_NoSurface)
+
+class LayerTreeHostContextTestLostContextSucceedsWithContent_WithSurface
+    : public LayerTreeHostContextTestLostContextSucceedsWithContent<true> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextSucceedsWithContent_WithSurface)
+
+template<int kTimesToRepeatLoss, int kTimesToFailRecreate>
+class LayerTreeHostContextTestLostContextFails :
+    public LayerTreeHostContextTest {
+ public:
+  LayerTreeHostContextTestLostContextFails()
+      : LayerTreeHostContextTest(),
+        num_commits_(0) {
+    times_to_lose_during_commit_ = 1;
+    times_to_repeat_loss_ = kTimesToRepeatLoss;
+    times_to_fail_recreate_ = kTimesToFailRecreate;
+  }
+
+  virtual void beginTest() OVERRIDE {
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void didRecreateOutputSurface(bool succeeded) OVERRIDE {
+    EXPECT_FALSE(succeeded);
+    endTest();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
+    LayerTreeHostContextTest::commitCompleteOnThread(host_impl);
+
+    ++num_commits_;
+    if (num_commits_ == 1) {
+      // When the context is ok, we should have these things.
+      EXPECT_TRUE(host_impl->outputSurface());
+      EXPECT_TRUE(host_impl->renderer());
+      EXPECT_TRUE(host_impl->resourceProvider());
+      return;
+    }
+
+    // When context recreation fails we shouldn't be left with any of them.
+    EXPECT_FALSE(host_impl->outputSurface());
+    EXPECT_FALSE(host_impl->renderer());
+    EXPECT_FALSE(host_impl->resourceProvider());
+  }
+
+  virtual void afterTest() OVERRIDE {}
+
+ private:
+  int num_commits_;
+};
+
+class LayerTreeHostContextTestLostContextFails_RepeatLoss100
+    : public LayerTreeHostContextTestLostContextFails<100, 0> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextFails_RepeatLoss100)
+
+class LayerTreeHostContextTestLostContextFails_FailRecreate100
+    : public LayerTreeHostContextTestLostContextFails<0, 100> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextFails_FailRecreate100)
+
+class LayerTreeHostContextTestFinishAllRenderingAfterLoss :
+      public LayerTreeHostContextTest {
+ public:
+  virtual void beginTest() OVERRIDE {
+    // Lose the context until the compositor gives up on it.
+    times_to_lose_during_commit_ = 1;
+    times_to_repeat_loss_ = 10;
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void didRecreateOutputSurface(bool succeeded) OVERRIDE {
+    EXPECT_FALSE(succeeded);
+    m_layerTreeHost->finishAllRendering();
+    endTest();
+  }
+
+  virtual void afterTest() OVERRIDE {}
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestFinishAllRenderingAfterLoss)
+
+template<bool kLoseAfterEvict>
+class LayerTreeHostContextTestLostContextAndEvictTextures :
+    public LayerTreeHostContextTest {
+ public:
+  LayerTreeHostContextTestLostContextAndEvictTextures()
+      : LayerTreeHostContextTest(),
+        layer_(FakeContentLayer::Create(&client_)),
+        impl_host_(0),
+        num_commits_(0) {
+  }
+
+  virtual void setupTree() OVERRIDE {
+    layer_->setBounds(gfx::Size(10, 20));
+    m_layerTreeHost->setRootLayer(layer_);
+    LayerTreeHostContextTest::setupTree();
+  }
+
+  virtual void beginTest() OVERRIDE {
+    postSetNeedsCommitToMainThread();
+  }
+
+  void PostEvictTextures() {
+    if (implThread()) {
+      implThread()->postTask(
+          base::Bind(
+              &LayerTreeHostContextTestLostContextAndEvictTextures::
+              EvictTexturesOnImplThread,
+              base::Unretained(this)));
+    } else {
+      DebugScopedSetImplThread impl(proxy());
+      EvictTexturesOnImplThread();
+    }
+  }
+
+  void EvictTexturesOnImplThread() {
+    impl_host_->enforceManagedMemoryPolicy(ManagedMemoryPolicy(0));
+    if (kLoseAfterEvict)
+      LoseContext();
+  }
+
+  virtual void didCommitAndDrawFrame() OVERRIDE {
+    if (num_commits_ > 1)
+      return;
+    EXPECT_TRUE(layer_->HaveBackingAt(0, 0));
+    PostEvictTextures();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
+    if (num_commits_ > 1)
+      return;
+    ++num_commits_;
+    if (!kLoseAfterEvict)
+      LoseContext();
+    impl_host_ = impl;
+  }
+
+  virtual void didRecreateOutputSurface(bool succeeded) OVERRIDE {
+    EXPECT_TRUE(succeeded);
+    endTest();
+  }
+
+  virtual void afterTest() OVERRIDE {}
+
+ private:
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> layer_;
+  LayerTreeHostImpl* impl_host_;
+  int num_commits_;
+};
+
+class LayerTreeHostContextTestLostContextAndEvictTextures_LoseAfterEvict
+    : public LayerTreeHostContextTestLostContextAndEvictTextures<true> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextAndEvictTextures_LoseAfterEvict);
+
+class LayerTreeHostContextTestLostContextAndEvictTextures_LoseBeforeEvict
+    : public LayerTreeHostContextTestLostContextAndEvictTextures<false> {};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextAndEvictTextures_LoseBeforeEvict);
+
+class LayerTreeHostContextTestLostContextWhileUpdatingResources :
+    public LayerTreeHostContextTest {
+ public:
+  LayerTreeHostContextTestLostContextWhileUpdatingResources()
+      : parent_(FakeContentLayer::Create(&client_)),
+        num_children_(50),
+        times_to_lose_on_end_query_(3) {
+  }
+
+  virtual scoped_ptr<FakeWebGraphicsContext3D> CreateContext3d() {
+    scoped_ptr<FakeWebGraphicsContext3D> context =
+        LayerTreeHostContextTest::CreateContext3d();
+    if (times_to_lose_on_end_query_) {
+      --times_to_lose_on_end_query_;
+      context->set_times_end_query_succeeds(5);
+    }
+    return context.Pass();
+  }
+
+  virtual void setupTree() {
+    parent_->setBounds(gfx::Size(num_children_, 1));
+
+    for (int i = 0; i < num_children_; i++) {
+      scoped_refptr<FakeContentLayer> child =
+          FakeContentLayer::Create(&client_);
+      child->setPosition(gfx::PointF(i, 0.f));
+      child->setBounds(gfx::Size(1, 1));
+      parent_->addChild(child);
+    }
+
+    m_layerTreeHost->setRootLayer(parent_);
+    LayerTreeHostContextTest::setupTree();
+  }
+
+  virtual void beginTest() {
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl* impl) {
+    endTest();
+  }
+
+  virtual void didRecreateOutputSurface(bool succeeded) OVERRIDE {
+    EXPECT_TRUE(succeeded);
+  }
+
+  virtual void afterTest() {
+    EXPECT_EQ(0, times_to_lose_on_end_query_);
+  }
+
+ private:
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> parent_;
+  int num_children_;
+  int times_to_lose_on_end_query_;
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostContextTestLostContextWhileUpdatingResources)
+
+class LayerTreeHostContextTestLayersNotified :
+    public LayerTreeHostContextTest {
+ public:
+  LayerTreeHostContextTestLayersNotified()
+      : LayerTreeHostContextTest(),
+        num_commits_(0) {
+  }
+
+  virtual void setupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    child_ = FakeContentLayer::Create(&client_);
+    grandchild_ = FakeContentLayer::Create(&client_);
+
+    root_->addChild(child_);
+    child_->addChild(grandchild_);
+
+    m_layerTreeHost->setRootLayer(root_);
+    LayerTreeHostContextTest::setupTree();
+  }
+
+  virtual void beginTest() OVERRIDE {
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
+    FakeContentLayerImpl* root = static_cast<FakeContentLayerImpl*>(
+        host_impl->rootLayer());
+    FakeContentLayerImpl* child = static_cast<FakeContentLayerImpl*>(
+        root->children()[0]);
+    FakeContentLayerImpl* grandchild = static_cast<FakeContentLayerImpl*>(
+        child->children()[0]);
+
+    ++num_commits_;
+    switch (num_commits_) {
+      case 1:
+        EXPECT_EQ(0u, root->lost_output_surface_count());
+        EXPECT_EQ(0u, child->lost_output_surface_count());
+        EXPECT_EQ(0u, grandchild->lost_output_surface_count());
+        // Lose the context and struggle to recreate it.
+        LoseContext();
+        times_to_fail_create_ = 1;
+        break;
+      case 2:
+        EXPECT_EQ(1u, root->lost_output_surface_count());
+        EXPECT_EQ(1u, child->lost_output_surface_count());
+        EXPECT_EQ(1u, grandchild->lost_output_surface_count());
+        // Lose the context and again during recreate.
+        LoseContext();
+        times_to_create_and_lose_ = 1;
+        break;
+      case 3:
+        EXPECT_EQ(3u, root->lost_output_surface_count());
+        EXPECT_EQ(3u, child->lost_output_surface_count());
+        EXPECT_EQ(3u, grandchild->lost_output_surface_count());
+        endTest();
+        break;
+      default:
+        NOTREACHED();
+    }
+  }
+
+  virtual void afterTest() OVERRIDE {}
+
+ private:
+  int num_commits_;
+
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> child_;
+  scoped_refptr<FakeContentLayer> grandchild_;
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostContextTestLayersNotified)
+
+class LayerTreeHostContextTestDontUseLostResources :
+    public LayerTreeHostContextTest {
+ public:
+  virtual void setupTree() OVERRIDE {
+    context3d_->set_have_extension_io_surface(true);
+    context3d_->set_have_extension_egl_image(true);
+
+    scoped_refptr<Layer> root_ = Layer::create();
+    root_->setBounds(gfx::Size(10, 10));
+    root_->setAnchorPoint(gfx::PointF());
+    root_->setIsDrawable(true);
+
+    scoped_refptr<DelegatedRendererLayer> delegated_ =
+        DelegatedRendererLayer::create();
+    delegated_->setBounds(gfx::Size(10, 10));
+    delegated_->setAnchorPoint(gfx::PointF());
+    delegated_->setIsDrawable(true);
+    root_->addChild(delegated_);
+
+    scoped_refptr<ContentLayer> content_ = ContentLayer::create(&client_);
+    content_->setBounds(gfx::Size(10, 10));
+    content_->setAnchorPoint(gfx::PointF());
+    content_->setIsDrawable(true);
+    root_->addChild(content_);
+
+    scoped_refptr<TextureLayer> texture_ = TextureLayer::create(NULL);
+    texture_->setBounds(gfx::Size(10, 10));
+    texture_->setAnchorPoint(gfx::PointF());
+    texture_->setTextureId(FakeWebGraphicsContext3D::kExternalTextureId);
+    texture_->setIsDrawable(true);
+    root_->addChild(texture_);
+
+    scoped_refptr<ContentLayer> mask_ = ContentLayer::create(&client_);
+    mask_->setBounds(gfx::Size(10, 10));
+    mask_->setAnchorPoint(gfx::PointF());
+
+    scoped_refptr<ContentLayer> content_with_mask_ =
+        ContentLayer::create(&client_);
+    content_with_mask_->setBounds(gfx::Size(10, 10));
+    content_with_mask_->setAnchorPoint(gfx::PointF());
+    content_with_mask_->setIsDrawable(true);
+    content_with_mask_->setMaskLayer(mask_.get());
+    root_->addChild(content_with_mask_);
+
+    VideoLayerImpl::FrameUnwrapper unwrapper =
+        base::Bind(FakeVideoFrame::ToVideoFrame);
+
+    scoped_refptr<VideoLayer> video_color_ = VideoLayer::create(
+        &color_frame_provider_, unwrapper);
+    video_color_->setBounds(gfx::Size(10, 10));
+    video_color_->setAnchorPoint(gfx::PointF());
+    video_color_->setIsDrawable(true);
+    root_->addChild(video_color_);
+
+    scoped_refptr<VideoLayer> video_hw_ = VideoLayer::create(
+        &hw_frame_provider_, unwrapper);
+    video_hw_->setBounds(gfx::Size(10, 10));
+    video_hw_->setAnchorPoint(gfx::PointF());
+    video_hw_->setIsDrawable(true);
+    root_->addChild(video_hw_);
+
+    scoped_refptr<VideoLayer> video_scaled_hw_ = VideoLayer::create(
+        &scaled_hw_frame_provider_, unwrapper);
+    video_scaled_hw_->setBounds(gfx::Size(10, 10));
+    video_scaled_hw_->setAnchorPoint(gfx::PointF());
+    video_scaled_hw_->setIsDrawable(true);
+    root_->addChild(video_scaled_hw_);
+
+    scoped_refptr<IOSurfaceLayer> io_surface_ = IOSurfaceLayer::create();
+    io_surface_->setBounds(gfx::Size(10, 10));
+    io_surface_->setAnchorPoint(gfx::PointF());
+    io_surface_->setIsDrawable(true);
+    io_surface_->setIOSurfaceProperties(1, gfx::Size(10, 10));
+    root_->addChild(io_surface_);
+
+    scoped_refptr<HeadsUpDisplayLayer> hud_ = HeadsUpDisplayLayer::create();
+    hud_->setBounds(gfx::Size(10, 10));
+    hud_->setAnchorPoint(gfx::PointF());
+    hud_->setIsDrawable(true);
+    root_->addChild(hud_);
+    // Enable the hud.
+    LayerTreeDebugState debug_state;
+    debug_state.showFPSCounter = true;
+    m_layerTreeHost->setDebugState(debug_state);
+
+    bool paint_scrollbar = true;
+    bool has_thumb = true;
+    scoped_refptr<ScrollbarLayer> scrollbar_ = ScrollbarLayer::create(
+        FakeWebScrollbar::create().PassAs<WebKit::WebScrollbar>(),
+        FakeScrollbarThemePainter::Create(paint_scrollbar)
+        .PassAs<ScrollbarThemePainter>(),
+        FakeWebScrollbarThemeGeometry::create(has_thumb)
+        .PassAs<WebKit::WebScrollbarThemeGeometry>(),
+        content_->id());
+    scrollbar_->setBounds(gfx::Size(10, 10));
+    scrollbar_->setAnchorPoint(gfx::PointF());
+    scrollbar_->setIsDrawable(true);
+    root_->addChild(scrollbar_);
+
+    m_layerTreeHost->setRootLayer(root_);
+    LayerTreeHostContextTest::setupTree();
+  }
+
+  virtual void beginTest() OVERRIDE {
+    postSetNeedsCommitToMainThread();
+  }
+
+  virtual void commitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
+    ResourceProvider* resource_provider = host_impl->resourceProvider();
+
+    if (host_impl->activeTree()->source_frame_number() == 0) {
+      // Set up impl resources on the first commit.
+
+      scoped_ptr<TestRenderPass> pass_for_quad = TestRenderPass::Create();
+      pass_for_quad->SetNew(
+          // AppendOneOfEveryQuadType() makes a RenderPass quad with this id.
+          RenderPass::Id(1, 1),
+          gfx::Rect(0, 0, 10, 10),
+          gfx::Rect(0, 0, 10, 10),
+          gfx::Transform());
+
+      scoped_ptr<TestRenderPass> pass = TestRenderPass::Create();
+      pass->SetNew(
+          RenderPass::Id(2, 1),
+          gfx::Rect(0, 0, 10, 10),
+          gfx::Rect(0, 0, 10, 10),
+          gfx::Transform());
+      pass->AppendOneOfEveryQuadType(resource_provider);
+
+      ScopedPtrVector<RenderPass> pass_list;
+      pass_list.append(pass_for_quad.PassAs<RenderPass>());
+      pass_list.append(pass.PassAs<RenderPass>());
+
+      // First child is the delegated layer.
+      DelegatedRendererLayerImpl* delegated_impl =
+          static_cast<DelegatedRendererLayerImpl*>(
+              host_impl->rootLayer()->children()[0]);
+      delegated_impl->setRenderPasses(pass_list);
+      EXPECT_TRUE(pass_list.isEmpty());
+
+      color_video_frame_ = make_scoped_ptr(new FakeVideoFrame(
+          VideoFrame::CreateColorFrame(
+              gfx::Size(4, 4), 0x80, 0x80, 0x80, base::TimeDelta())));
+      hw_video_frame_ = make_scoped_ptr(new FakeVideoFrame(
+          VideoFrame::WrapNativeTexture(
+              resource_provider->graphicsContext3D()->createTexture(),
+              GL_TEXTURE_2D,
+              gfx::Size(4, 4), gfx::Rect(0, 0, 4, 4), gfx::Size(4, 4),
+              base::TimeDelta(),
+              VideoFrame::ReadPixelsCB(),
+              base::Closure())));
+      scaled_hw_video_frame_ = make_scoped_ptr(new FakeVideoFrame(
+          VideoFrame::WrapNativeTexture(
+              resource_provider->graphicsContext3D()->createTexture(),
+              GL_TEXTURE_2D,
+              gfx::Size(4, 4), gfx::Rect(0, 0, 3, 2), gfx::Size(4, 4),
+              base::TimeDelta(),
+              VideoFrame::ReadPixelsCB(),
+              base::Closure())));
+
+      color_frame_provider_.set_frame(color_video_frame_.get());
+      hw_frame_provider_.set_frame(hw_video_frame_.get());
+      scaled_hw_frame_provider_.set_frame(scaled_hw_video_frame_.get());
+      return;
+    }
+
+    if (host_impl->activeTree()->source_frame_number() == 3) {
+      // On the third commit we're recovering from context loss. Hardware
+      // video frames should not be reused by the VideoFrameProvider, but
+      // software frames can be.
+      hw_frame_provider_.set_frame(NULL);
+      scaled_hw_frame_provider_.set_frame(NULL);
+    }
+  }
+
+  virtual bool prepareToDrawOnThread(LayerTreeHostImpl* host_impl) {
+    if (host_impl->activeTree()->source_frame_number() == 2) {
+      // Lose the context during draw on the second commit. This will cause
+      // a third commit to recover.
+      if (context3d_)
+        context3d_->set_times_bind_texture_succeeds(4);
+    }
+    return true;
+  }
+
+  virtual void didCommitAndDrawFrame() OVERRIDE {
+    // End the test once we know the 3nd frame drew.
+    if (m_layerTreeHost->commitNumber() == 4)
+      endTest();
+  }
+
+  virtual void afterTest() OVERRIDE {}
+
+ private:
+  FakeContentLayerClient client_;
+
+  scoped_refptr<Layer> root_;
+  scoped_refptr<DelegatedRendererLayer> delegated_;
+  scoped_refptr<ContentLayer> content_;
+  scoped_refptr<TextureLayer> texture_;
+  scoped_refptr<ContentLayer> mask_;
+  scoped_refptr<ContentLayer> content_with_mask_;
+  scoped_refptr<VideoLayer> video_color_;
+  scoped_refptr<VideoLayer> video_hw_;
+  scoped_refptr<VideoLayer> video_scaled_hw_;
+  scoped_refptr<IOSurfaceLayer> io_surface_;
+  scoped_refptr<HeadsUpDisplayLayer> hud_;
+  scoped_refptr<ScrollbarLayer> scrollbar_;
+
+  scoped_ptr<FakeVideoFrame> color_video_frame_;
+  scoped_ptr<FakeVideoFrame> hw_video_frame_;
+  scoped_ptr<FakeVideoFrame> scaled_hw_video_frame_;
+
+  FakeVideoFrameProvider color_frame_provider_;
+  FakeVideoFrameProvider hw_frame_provider_;
+  FakeVideoFrameProvider scaled_hw_frame_provider_;
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostContextTestDontUseLostResources)
+
+}  // namespace
+}  // namespace cc