cc: Allow copy requests to provide a texture.

cc/trees/layer_tree_host_unittest_copyrequest.cc

Index: cc/trees/layer_tree_host_unittest_copyrequest.cc
diff --git a/cc/trees/layer_tree_host_unittest_copyrequest.cc b/cc/trees/layer_tree_host_unittest_copyrequest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a7fad10921dc610059258572bd0a9214da6809b5
--- /dev/null
+++ b/cc/trees/layer_tree_host_unittest_copyrequest.cc
@@ -0,0 +1,831 @@
+// Copyright 2013 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/output/copy_output_request.h"
+#include "cc/output/copy_output_result.h"
+#include "cc/test/fake_content_layer.h"
+#include "cc/test/fake_content_layer_client.h"
+#include "cc/test/fake_output_surface.h"
+#include "cc/test/layer_tree_test.h"
+#include "cc/trees/layer_tree_impl.h"
+#include "gpu/GLES2/gl2extchromium.h"
+
+namespace cc {
+namespace {
+
+// These tests only use direct rendering, as there is no output to copy for
+// delegated renderers.
+class LayerTreeHostCopyRequestTest : public LayerTreeTest {};
+
+class LayerTreeHostCopyRequestTestMultipleRequests
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root = FakeContentLayer::Create(&client_);
+    root->SetBounds(gfx::Size(20, 20));
+
+    child = FakeContentLayer::Create(&client_);
+    child->SetBounds(gfx::Size(10, 10));
+    root->AddChild(child);
+
+    layer_tree_host()->SetRootLayer(root);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
+
+  virtual void DidCommitAndDrawFrame() OVERRIDE { WaitForCallback(); }
+
+  void WaitForCallback() {
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::NextStep,
+                   base::Unretained(this)));
+  }
+
+  void NextStep() {
+    int frame = layer_tree_host()->source_frame_number();
+    switch (frame) {
+      case 1:
+        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
+            base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::
+                            CopyOutputCallback,
+                       base::Unretained(this))));
+        EXPECT_EQ(0u, callbacks_.size());
+        break;
+      case 2:
+        if (callbacks_.size() < 1u) {
+          WaitForCallback();
+          return;
+        }
+        EXPECT_EQ(1u, callbacks_.size());
+        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[0].ToString());
+
+        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
+            base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::
+                            CopyOutputCallback,
+                       base::Unretained(this))));
+        root->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
+            base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::
+                            CopyOutputCallback,
+                       base::Unretained(this))));
+        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
+            base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::
+                            CopyOutputCallback,
+                       base::Unretained(this))));
+        EXPECT_EQ(1u, callbacks_.size());
+        break;
+      case 3:
+        if (callbacks_.size() < 4u) {
+          WaitForCallback();
+          return;
+        }
+        EXPECT_EQ(4u, callbacks_.size());
+        // The child was copied to a bitmap and passed back twice.
+        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[1].ToString());
+        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[2].ToString());
+        // The root was copied to a bitmap and passed back also.
+        EXPECT_EQ(gfx::Size(20, 20).ToString(), callbacks_[3].ToString());
+        EndTest();
+        break;
+    }
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_TRUE(result->HasBitmap());
+    scoped_ptr<SkBitmap> bitmap = result->TakeBitmap().Pass();
+    EXPECT_EQ(result->size().ToString(),
+              gfx::Size(bitmap->width(), bitmap->height()).ToString());
+    callbacks_.push_back(result->size());
+  }
+
+  virtual void AfterTest() OVERRIDE { EXPECT_EQ(4u, callbacks_.size()); }
+
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
+    scoped_ptr<FakeOutputSurface> output_surface;
+    if (use_gl_renderer_) {
+      output_surface = FakeOutputSurface::Create3d().Pass();
+    } else {
+      output_surface = FakeOutputSurface::CreateSoftware(
+          make_scoped_ptr(new SoftwareOutputDevice)).Pass();
+    }
+    return output_surface.PassAs<OutputSurface>();
+  }
+
+  bool use_gl_renderer_;
+  std::vector<gfx::Size> callbacks_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root;
+  scoped_refptr<FakeContentLayer> child;
+};
+
+// Readback can't be done with a delegating renderer.
+TEST_F(LayerTreeHostCopyRequestTestMultipleRequests,
+       GLRenderer_RunSingleThread) {
+  use_gl_renderer_ = true;
+  RunTest(false, false, false);
+}
+
+TEST_F(LayerTreeHostCopyRequestTestMultipleRequests,
+       GLRenderer_RunMultiThread_MainThreadPainting) {
+  use_gl_renderer_ = true;
+  RunTest(true, false, false);
+}
+
+TEST_F(LayerTreeHostCopyRequestTestMultipleRequests,
+       SoftwareRenderer_RunSingleThread) {
+  use_gl_renderer_ = false;
+  RunTest(false, false, false);
+}
+
+TEST_F(LayerTreeHostCopyRequestTestMultipleRequests,
+       SoftwareRenderer_RunMultiThread_MainThreadPainting) {
+  use_gl_renderer_ = false;
+  RunTest(true, false, false);
+}
+
+class LayerTreeHostCopyRequestTestLayerDestroyed
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    main_destroyed_ = FakeContentLayer::Create(&client_);
+    main_destroyed_->SetBounds(gfx::Size(15, 15));
+    root_->AddChild(main_destroyed_);
+
+    impl_destroyed_ = FakeContentLayer::Create(&client_);
+    impl_destroyed_->SetBounds(gfx::Size(10, 10));
+    root_->AddChild(impl_destroyed_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    callback_count_ = 0;
+    PostSetNeedsCommitToMainThread();
+  }
+
+  virtual void DidCommit() OVERRIDE {
+    int frame = layer_tree_host()->source_frame_number();
+    switch (frame) {
+      case 1:
+        main_destroyed_->RequestCopyOfOutput(
+            CopyOutputRequest::CreateBitmapRequest(base::Bind(
+                &LayerTreeHostCopyRequestTestLayerDestroyed::CopyOutputCallback,
+                base::Unretained(this))));
+        impl_destroyed_->RequestCopyOfOutput(
+            CopyOutputRequest::CreateBitmapRequest(base::Bind(
+                &LayerTreeHostCopyRequestTestLayerDestroyed::CopyOutputCallback,
+                base::Unretained(this))));
+        EXPECT_EQ(0, callback_count_);
+
+        // Destroy the main thread layer right away.
+        main_destroyed_->RemoveFromParent();
+        main_destroyed_ = NULL;
+
+        // Should callback with a NULL bitmap.
+        EXPECT_EQ(1, callback_count_);
+
+        // Prevent drawing so we can't make a copy of the impl_destroyed layer.
+        layer_tree_host()->SetViewportSize(gfx::Size());
+        break;
+      case 2:
+        // Flush the message loops and make sure the callbacks run.
+        layer_tree_host()->SetNeedsCommit();
+        break;
+      case 3:
+        // No drawing means no readback yet.
+        EXPECT_EQ(1, callback_count_);
+
+        // Destroy the impl thread layer.
+        impl_destroyed_->RemoveFromParent();
+        impl_destroyed_ = NULL;
+
+        // No callback yet because it's on the impl side.
+        EXPECT_EQ(1, callback_count_);
+        break;
+      case 4:
+        // Flush the message loops and make sure the callbacks run.
+        layer_tree_host()->SetNeedsCommit();
+        break;
+      case 5:
+        // We should get another callback with a NULL bitmap.
+        EXPECT_EQ(2, callback_count_);
+        EndTest();
+        break;
+    }
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_TRUE(result->IsEmpty());
+    ++callback_count_;
+  }
+
+  virtual void AfterTest() OVERRIDE {}
+
+  int callback_count_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> main_destroyed_;
+  scoped_refptr<FakeContentLayer> impl_destroyed_;
+};
+
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostCopyRequestTestLayerDestroyed);
+
+class LayerTreeHostCopyRequestTestInHiddenSubtree
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    grand_parent_layer_ = FakeContentLayer::Create(&client_);
+    grand_parent_layer_->SetBounds(gfx::Size(15, 15));
+    root_->AddChild(grand_parent_layer_);
+
+    // parent_layer_ owns a render surface.
+    parent_layer_ = FakeContentLayer::Create(&client_);
+    parent_layer_->SetBounds(gfx::Size(15, 15));
+    parent_layer_->SetForceRenderSurface(true);
+    grand_parent_layer_->AddChild(parent_layer_);
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    parent_layer_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  void AddCopyRequest(Layer* layer) {
+    layer->RequestCopyOfOutput(
+        CopyOutputRequest::CreateBitmapRequest(base::Bind(
+            &LayerTreeHostCopyRequestTestInHiddenSubtree::CopyOutputCallback,
+            base::Unretained(this))));
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    callback_count_ = 0;
+    PostSetNeedsCommitToMainThread();
+
+    AddCopyRequest(copy_layer_.get());
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    ++callback_count_;
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_EQ(copy_layer_->bounds().ToString(), result->size().ToString())
+        << callback_count_;
+    switch (callback_count_) {
+      case 1:
+        // Hide the copy request layer.
+        grand_parent_layer_->SetHideLayerAndSubtree(false);
+        parent_layer_->SetHideLayerAndSubtree(false);
+        copy_layer_->SetHideLayerAndSubtree(true);
+        AddCopyRequest(copy_layer_.get());
+        break;
+      case 2:
+        // Hide the copy request layer's parent only.
+        grand_parent_layer_->SetHideLayerAndSubtree(false);
+        parent_layer_->SetHideLayerAndSubtree(true);
+        copy_layer_->SetHideLayerAndSubtree(false);
+        AddCopyRequest(copy_layer_.get());
+        break;
+      case 3:
+        // Hide the copy request layer's grand parent only.
+        grand_parent_layer_->SetHideLayerAndSubtree(true);
+        parent_layer_->SetHideLayerAndSubtree(false);
+        copy_layer_->SetHideLayerAndSubtree(false);
+        AddCopyRequest(copy_layer_.get());
+        break;
+      case 4:
+        // Hide the copy request layer's parent and grandparent.
+        grand_parent_layer_->SetHideLayerAndSubtree(true);
+        parent_layer_->SetHideLayerAndSubtree(true);
+        copy_layer_->SetHideLayerAndSubtree(false);
+        AddCopyRequest(copy_layer_.get());
+        break;
+      case 5:
+        // Hide the copy request layer as well as its parent and grandparent.
+        grand_parent_layer_->SetHideLayerAndSubtree(true);
+        parent_layer_->SetHideLayerAndSubtree(true);
+        copy_layer_->SetHideLayerAndSubtree(true);
+        AddCopyRequest(copy_layer_.get());
+        break;
+      case 6:
+        EndTest();
+        break;
+    }
+  }
+
+  virtual void AfterTest() OVERRIDE {}
+
+  int callback_count_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> grand_parent_layer_;
+  scoped_refptr<FakeContentLayer> parent_layer_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_NOIMPL_TEST_F(
+    LayerTreeHostCopyRequestTestInHiddenSubtree);
+
+class LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    grand_parent_layer_ = FakeContentLayer::Create(&client_);
+    grand_parent_layer_->SetBounds(gfx::Size(15, 15));
+    grand_parent_layer_->SetHideLayerAndSubtree(true);
+    root_->AddChild(grand_parent_layer_);
+
+    // parent_layer_ owns a render surface.
+    parent_layer_ = FakeContentLayer::Create(&client_);
+    parent_layer_->SetBounds(gfx::Size(15, 15));
+    parent_layer_->SetForceRenderSurface(true);
+    grand_parent_layer_->AddChild(parent_layer_);
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    parent_layer_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    did_draw_ = false;
+    PostSetNeedsCommitToMainThread();
+
+    copy_layer_->RequestCopyOfOutput(
+        CopyOutputRequest::CreateBitmapRequest(base::Bind(
+            &LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest::
+                 CopyOutputCallback,
+            base::Unretained(this))));
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_EQ(copy_layer_->bounds().ToString(), result->size().ToString());
+    EndTest();
+  }
+
+  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
+    Renderer* renderer = host_impl->renderer();
+
+    LayerImpl* root = host_impl->active_tree()->root_layer();
+    LayerImpl* grand_parent = root->children()[0];
+    LayerImpl* parent = grand_parent->children()[0];
+    LayerImpl* copy_layer = parent->children()[0];
+
+    // |parent| owns a surface, but it was hidden and not part of the copy
+    // request so it should not allocate any resource.
+    EXPECT_FALSE(renderer->HasAllocatedResourcesForTesting(
+        parent->render_surface()->RenderPassId()));
+
+    // |copy_layer| should have been rendered to a texture since it was needed
+    // for a copy request.
+    EXPECT_TRUE(renderer->HasAllocatedResourcesForTesting(
+        copy_layer->render_surface()->RenderPassId()));
+
+    did_draw_ = true;
+  }
+
+  virtual void AfterTest() OVERRIDE { EXPECT_TRUE(did_draw_); }
+
+  FakeContentLayerClient client_;
+  bool did_draw_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> grand_parent_layer_;
+  scoped_refptr<FakeContentLayer> parent_layer_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+};
+
+// No output to copy for delegated renderers.
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
+    LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest);
+
+class LayerTreeHostCopyRequestTestClippedOut
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    parent_layer_ = FakeContentLayer::Create(&client_);
+    parent_layer_->SetBounds(gfx::Size(15, 15));
+    parent_layer_->SetMasksToBounds(true);
+    root_->AddChild(parent_layer_);
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetPosition(gfx::Point(15, 15));
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    parent_layer_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    PostSetNeedsCommitToMainThread();
+
+    copy_layer_->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
+        base::Bind(&LayerTreeHostCopyRequestTestClippedOut::CopyOutputCallback,
+                   base::Unretained(this))));
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    // We should still get a callback with no output if the copy requested layer
+    // was completely clipped away.
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_EQ(gfx::Size().ToString(), result->size().ToString());
+    EndTest();
+  }
+
+  virtual void AfterTest() OVERRIDE {}
+
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> parent_layer_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
+    LayerTreeHostCopyRequestTestClippedOut);
+
+class LayerTreeHostTestAsyncTwoReadbacksWithoutDraw
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    root_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  void AddCopyRequest(Layer* layer) {
+    layer->RequestCopyOfOutput(
+        CopyOutputRequest::CreateBitmapRequest(base::Bind(
+            &LayerTreeHostTestAsyncTwoReadbacksWithoutDraw::CopyOutputCallback,
+            base::Unretained(this))));
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    saw_copy_request_ = false;
+    callback_count_ = 0;
+    PostSetNeedsCommitToMainThread();
+
+    // Prevent drawing.
+    layer_tree_host()->SetViewportSize(gfx::Size(0, 0));
+
+    AddCopyRequest(copy_layer_.get());
+  }
+
+  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
+    if (impl->active_tree()->source_frame_number() == 0) {
+      LayerImpl* root = impl->active_tree()->root_layer();
+      EXPECT_TRUE(root->children()[0]->HasCopyRequest());
+      saw_copy_request_ = true;
+    }
+  }
+
+  virtual void DidCommit() OVERRIDE {
+    if (layer_tree_host()->source_frame_number() == 1) {
+      // Allow drawing.
+      layer_tree_host()->SetViewportSize(gfx::Size(root_->bounds()));
+
+      AddCopyRequest(copy_layer_.get());
+    }
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_EQ(copy_layer_->bounds().ToString(), result->size().ToString());
+    ++callback_count_;
+
+    if (callback_count_ == 2)
+      EndTest();
+  }
+
+  virtual void AfterTest() OVERRIDE { EXPECT_TRUE(saw_copy_request_); }
+
+  bool saw_copy_request_;
+  int callback_count_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_NOIMPL_TEST_F(
+    LayerTreeHostTestAsyncTwoReadbacksWithoutDraw);
+
+class LayerTreeHostCopyRequestTestLostOutputSurface
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
+    if (!first_context_provider_.get()) {
+      first_context_provider_ = TestContextProvider::Create();
+      return FakeOutputSurface::Create3d(first_context_provider_)
+          .PassAs<OutputSurface>();
+    }
+
+    EXPECT_FALSE(second_context_provider_.get());
+    second_context_provider_ = TestContextProvider::Create();
+    return FakeOutputSurface::Create3d(second_context_provider_)
+        .PassAs<OutputSurface>();
+  }
+
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    root_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
+    EXPECT_EQ(gfx::Size(10, 10).ToString(), result->size().ToString());
+    EXPECT_TRUE(result->HasTexture());
+
+    // Save the result for later.
+    EXPECT_FALSE(result_);
+    result_ = result.Pass();
+
+    // Post a commit to lose the output surface.
+    layer_tree_host()->SetNeedsCommit();
+  }
+
+  virtual void DidCommitAndDrawFrame() OVERRIDE {
+    switch (layer_tree_host()->source_frame_number()) {
+      case 1:
+        // The layers have been pushed to the impl side. The layer textures have
+        // been allocated.
+
+        // Request a copy of the layer. This will use another texture.
+        copy_layer_->RequestCopyOfOutput(CopyOutputRequest::CreateRequest(
+            base::Bind(&LayerTreeHostCopyRequestTestLostOutputSurface::
+                            CopyOutputCallback,
+                       base::Unretained(this))));
+        break;
+      case 4:
+      // With SingleThreadProxy it takes two commits to finally swap after a
+      // context loss.
+      case 5:
+        // Now destroy the CopyOutputResult, releasing the texture inside back
+        // to the compositor.
+        EXPECT_TRUE(result_);
+        result_.reset();
+
+        // Check that it is released.
+        ImplThreadTaskRunner()->PostTask(
+            FROM_HERE,
+            base::Bind(&LayerTreeHostCopyRequestTestLostOutputSurface::
+                            CheckNumTextures,
+                       base::Unretained(this),
+                       num_textures_after_loss_ - 1));
+        break;
+    }
+  }
+
+  virtual void SwapBuffersOnThread(LayerTreeHostImpl* impl,
+                                   bool result) OVERRIDE {
+    switch (impl->active_tree()->source_frame_number()) {
+      case 0:
+        // The layers have been drawn, so their textures have been allocated.
+        EXPECT_FALSE(result_);
+        num_textures_without_readback_ =
+            first_context_provider_->TestContext3d()->NumTextures();
+        break;
+      case 1:
+        // We did a readback, so there will be a readback texture around now.
+        EXPECT_LT(num_textures_without_readback_,
+                  first_context_provider_->TestContext3d()->NumTextures());
+        break;
+      case 2:
+        // The readback texture is collected.
+        EXPECT_TRUE(result_);
+
+        // Lose the output surface.
+        first_context_provider_->TestContext3d()->loseContextCHROMIUM(
+            GL_GUILTY_CONTEXT_RESET_ARB, GL_INNOCENT_CONTEXT_RESET_ARB);
+        break;
+      case 3:
+      // With SingleThreadProxy it takes two commits to finally swap after a
+      // context loss.
+      case 4:
+        // The output surface has been recreated.
+        EXPECT_TRUE(second_context_provider_.get());
+
+        num_textures_after_loss_ =
+            first_context_provider_->TestContext3d()->NumTextures();
+        break;
+    }
+  }
+
+  void CheckNumTextures(size_t expected_num_textures) {
+    EXPECT_EQ(expected_num_textures,
+              first_context_provider_->TestContext3d()->NumTextures());
+    EndTest();
+  }
+
+  virtual void AfterTest() OVERRIDE {}
+
+  scoped_refptr<TestContextProvider> first_context_provider_;
+  scoped_refptr<TestContextProvider> second_context_provider_;
+  size_t num_textures_without_readback_;
+  size_t num_textures_after_loss_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+  scoped_ptr<CopyOutputResult> result_;
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_NOIMPL_TEST_F(
+    LayerTreeHostCopyRequestTestLostOutputSurface);
+
+class LayerTreeHostCopyRequestTestCountTextures
+    : public LayerTreeHostCopyRequestTest {
+ protected:
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
+    context_provider_ = TestContextProvider::Create();
+    return FakeOutputSurface::Create3d(context_provider_)
+        .PassAs<OutputSurface>();
+  }
+
+  virtual void SetupTree() OVERRIDE {
+    root_ = FakeContentLayer::Create(&client_);
+    root_->SetBounds(gfx::Size(20, 20));
+
+    copy_layer_ = FakeContentLayer::Create(&client_);
+    copy_layer_->SetBounds(gfx::Size(10, 10));
+    root_->AddChild(copy_layer_);
+
+    layer_tree_host()->SetRootLayer(root_);
+    LayerTreeHostCopyRequestTest::SetupTree();
+  }
+
+  virtual void BeginTest() OVERRIDE {
+    num_textures_without_readback_ = 0;
+    num_textures_with_readback_ = 0;
+    waited_sync_point_after_readback_ = 0;
+    PostSetNeedsCommitToMainThread();
+  }
+
+  virtual void RequestCopy(Layer* layer) = 0;
+
+  virtual void DidCommitAndDrawFrame() OVERRIDE {
+    switch (layer_tree_host()->source_frame_number()) {
+      case 1:
+        // The layers have been pushed to the impl side. The layer textures have
+        // been allocated.
+        RequestCopy(copy_layer_.get());
+        break;
+    }
+  }
+
+  virtual void SwapBuffersOnThread(LayerTreeHostImpl* impl,
+                                   bool result) OVERRIDE {
+    switch (impl->active_tree()->source_frame_number()) {
+      case 0:
+        // The layers have been drawn, so their textures have been allocated.
+        num_textures_without_readback_ =
+            context_provider_->TestContext3d()->NumTextures();
+        break;
+      case 1:
+        // We did a readback, so there will be a readback texture around now.
+        num_textures_with_readback_ =
+            context_provider_->TestContext3d()->NumTextures();
+        waited_sync_point_after_readback_ =
+            context_provider_->TestContext3d()->last_waited_sync_point();
+
+        MainThreadTaskRunner()->PostTask(
+            FROM_HERE,
+            base::Bind(&LayerTreeHostCopyRequestTestCountTextures::DoEndTest,
+                       base::Unretained(this)));
+        break;
+    }
+  }
+
+  virtual void DoEndTest() { EndTest(); }
+
+  scoped_refptr<TestContextProvider> context_provider_;
+  size_t num_textures_without_readback_;
+  size_t num_textures_with_readback_;
+  unsigned waited_sync_point_after_readback_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakeContentLayer> root_;
+  scoped_refptr<FakeContentLayer> copy_layer_;
+};
+
+class LayerTreeHostCopyRequestTestCreatesTexture
+    : public LayerTreeHostCopyRequestTestCountTextures {
+ protected:
+  virtual void RequestCopy(Layer* layer) OVERRIDE {
+    // Request a normal texture copy. This should create a new texture.
+    copy_layer_->RequestCopyOfOutput(
+        CopyOutputRequest::CreateRequest(base::Bind(
+            &LayerTreeHostCopyRequestTestCreatesTexture::CopyOutputCallback,
+            base::Unretained(this))));
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_FALSE(result->IsEmpty());
+    EXPECT_TRUE(result->HasTexture());
+
+    TextureMailbox mailbox;
+    scoped_ptr<SingleReleaseCallback> release;
+    result->TakeTexture(&mailbox, &release);
+    EXPECT_TRUE(release);
+
+    release->Run(0, false);
+  }
+
+  virtual void AfterTest() OVERRIDE {
+    // No sync point was needed.
+    EXPECT_EQ(0u, waited_sync_point_after_readback_);
+    // Except the copy to have made another texture.
+    EXPECT_EQ(num_textures_without_readback_ + 1, num_textures_with_readback_);
+  }
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_NOIMPL_TEST_F(
+    LayerTreeHostCopyRequestTestCreatesTexture);
+
+class LayerTreeHostCopyRequestTestProvideTexture
+    : public LayerTreeHostCopyRequestTestCountTextures {
+ protected:
+  virtual void BeginTest() OVERRIDE {
+    external_context_provider_ = TestContextProvider::Create();
+    EXPECT_TRUE(external_context_provider_->BindToCurrentThread());
+    LayerTreeHostCopyRequestTestCountTextures::BeginTest();
+  }
+
+  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
+    EXPECT_FALSE(result->IsEmpty());
+    EXPECT_TRUE(result->HasTexture());
+
+    TextureMailbox mailbox;
+    scoped_ptr<SingleReleaseCallback> release;
+    result->TakeTexture(&mailbox, &release);
+    EXPECT_FALSE(release);
+  }
+
+  virtual void RequestCopy(Layer* layer) OVERRIDE {
+    // Request a copy to a provided texture. This should not create a new
+    // texture.
+    scoped_ptr<CopyOutputRequest> request =
+        CopyOutputRequest::CreateRequest(base::Bind(
+            &LayerTreeHostCopyRequestTestProvideTexture::CopyOutputCallback,
+            base::Unretained(this)));
+
+    gpu::Mailbox mailbox;
+    external_context_provider_->Context3d()->genMailboxCHROMIUM(mailbox.name);
+    sync_point_ = external_context_provider_->Context3d()->insertSyncPoint();
+    request->SetTextureMailbox(TextureMailbox(mailbox, sync_point_));
+    EXPECT_TRUE(request->has_texture_mailbox());
+
+    copy_layer_->RequestCopyOfOutput(request.Pass());
+  }
+
+  virtual void AfterTest() OVERRIDE {
+    // Expect the compositor to have waited for the sync point in the provided
+    // TextureMailbox.
+    EXPECT_EQ(sync_point_, waited_sync_point_after_readback_);
+    // Except the copy to have *not* made another texture.
+    EXPECT_EQ(num_textures_without_readback_, num_textures_with_readback_);
+  }
+
+  scoped_refptr<TestContextProvider> external_context_provider_;
+  unsigned sync_point_;
+};
+
+SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_NOIMPL_TEST_F(
+    LayerTreeHostCopyRequestTestProvideTexture);
+
+}  // namespace
+}  // namespace cc