Chromium -> Mojo roll.

cc/trees/layer_tree_host_common_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <algorithm>
 #include <set>
 
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 10 matching lines @@
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/test/animation_test_common.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_picture_layer.h"
 #include "cc/test/fake_picture_layer_impl.h"
 #include "cc/test/geometry_test_utils.h"
 #include "cc/test/layer_tree_host_common_test.h"
+#include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/proxy.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/quad_f.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
@@ skipping 267 matching lines @@
   const gfx::ScrollOffset kScrollOffset(50, 100);
   const gfx::Vector2dF kScrollDelta(2.34f, 5.67f);
   const gfx::Vector2d kMaxScrollOffset(200, 200);
   const gfx::PointF kScrollLayerPosition(-kScrollOffset.x(),
                                          -kScrollOffset.y());
   const float kPageScale = 0.888f;
   const float kDeviceScale = 1.666f;
 
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
 
   gfx::Transform identity_matrix;
   scoped_ptr<LayerImpl> sublayer_scoped_ptr(
       LayerImpl::Create(host_impl.active_tree(), 1));
   LayerImpl* sublayer = sublayer_scoped_ptr.get();
   sublayer->SetContentsScale(kPageScale * kDeviceScale,
                              kPageScale * kDeviceScale);
   SetLayerPropertiesForTesting(sublayer, identity_matrix, gfx::Point3F(),
                                gfx::PointF(), gfx::Size(500, 500), true, false,
                                false);
@@ skipping 5385 matching lines @@
   host->SetRootLayer(root);
 
   ExecuteCalculateDrawProperties(root.get());
 
   EXPECT_FALSE(child->render_surface());
 }
 
 TEST_F(LayerTreeHostCommonTest, OpacityAnimatingOnPendingTree) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.pending_tree(), 1);
 
   const gfx::Transform identity_matrix;
   SetLayerPropertiesForTesting(root.get(), identity_matrix, gfx::Point3F(),
                                gfx::PointF(), gfx::Size(100, 100), true, false,
                                false);
   root->SetDrawsContent(true);
 
   scoped_ptr<LayerImpl> child = LayerImpl::Create(host_impl.pending_tree(), 2);
@@ skipping 21 matching lines @@
   ASSERT_EQ(1u, render_surface_layer_list.size());
   ASSERT_EQ(2u, root->render_surface()->layer_list().size());
 }
 
 using LCDTextTestParam = std::tr1::tuple<bool, bool, bool>;
 class LCDTextTest
     : public LayerTreeHostCommonTestBase,
       public testing::TestWithParam<LCDTextTestParam> {
  public:
   LCDTextTest()
-      : host_impl_(&proxy_, &shared_bitmap_manager_),
+      : host_impl_(&proxy_, &shared_bitmap_manager_, &task_graph_runner_),
         root_(nullptr),
         child_(nullptr),
         grand_child_(nullptr) {}
 
  protected:
   void SetUp() override {
     can_use_lcd_text_ = std::tr1::get<0>(GetParam());
     layers_always_allowed_lcd_text_ = std::tr1::get<1>(GetParam());
 
     scoped_ptr<LayerImpl> root_ptr =
@@ skipping 26 matching lines @@
     SetLayerPropertiesForTesting(grand_child_, identity_matrix, gfx::Point3F(),
                                  gfx::PointF(), gfx::Size(1, 1), true, false,
                                  false);
   }
 
   bool can_use_lcd_text_;
   bool layers_always_allowed_lcd_text_;
 
   FakeImplProxy proxy_;
   TestSharedBitmapManager shared_bitmap_manager_;
+  TestTaskGraphRunner task_graph_runner_;
   FakeLayerTreeHostImpl host_impl_;
 
   LayerImpl* root_;
   LayerImpl* child_;
   LayerImpl* grand_child_;
 };
 
 TEST_P(LCDTextTest, CanUseLCDText) {
   bool expect_lcd_text = can_use_lcd_text_ || layers_always_allowed_lcd_text_;
   bool expect_not_lcd_text = layers_always_allowed_lcd_text_;
@@ skipping 117 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(LayerTreeHostCommonTest,
                         LCDTextTest,
                         testing::Combine(testing::Bool(),
                                          testing::Bool(),
                                          testing::Bool()));
 
 TEST_F(LayerTreeHostCommonTest, SubtreeHidden_SingleLayer) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_refptr<Layer> root = Layer::Create();
   SetLayerPropertiesForTesting(root.get(),
                                identity_matrix,
                                gfx::Point3F(),
                                gfx::PointF(),
                                gfx::Size(50, 50),
                                true,
@@ skipping 37 matching lines @@
   // hidden itself.
   ASSERT_EQ(1u, render_surface_layer_list.size());
   ASSERT_EQ(2u, root->render_surface()->layer_list().size());
   EXPECT_EQ(root->id(), root->render_surface()->layer_list().at(0)->id());
   EXPECT_EQ(child->id(), root->render_surface()->layer_list().at(1)->id());
 }
 
 TEST_F(LayerTreeHostCommonTest, SubtreeHidden_SingleLayerImpl) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.pending_tree(), 1);
   SetLayerPropertiesForTesting(root.get(), identity_matrix, gfx::Point3F(),
                                gfx::PointF(), gfx::Size(50, 50), true, false,
                                false);
   root->SetDrawsContent(true);
 
   scoped_ptr<LayerImpl> child = LayerImpl::Create(host_impl.pending_tree(), 2);
@@ skipping 24 matching lines @@
   // hidden itself.
   ASSERT_EQ(1u, render_surface_layer_list.size());
   ASSERT_EQ(2u, root->render_surface()->layer_list().size());
   EXPECT_EQ(1, root->render_surface()->layer_list().at(0)->id());
   EXPECT_EQ(2, root->render_surface()->layer_list().at(1)->id());
 }
 
 TEST_F(LayerTreeHostCommonTest, SubtreeHidden_TwoLayers) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_refptr<Layer> root = Layer::Create();
   SetLayerPropertiesForTesting(root.get(),
                                identity_matrix,
                                gfx::Point3F(),
                                gfx::PointF(),
                                gfx::Size(50, 50),
                                true,
@@ skipping 36 matching lines @@
   // We should have one render surface and one layers. The child has
   // hidden itself and the grand child.
   ASSERT_EQ(1u, render_surface_layer_list.size());
   ASSERT_EQ(1u, root->render_surface()->layer_list().size());
   EXPECT_EQ(root->id(), root->render_surface()->layer_list().at(0)->id());
 }
 
 TEST_F(LayerTreeHostCommonTest, SubtreeHidden_TwoLayersImpl) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.pending_tree(), 1);
   SetLayerPropertiesForTesting(root.get(), identity_matrix, gfx::Point3F(),
                                gfx::PointF(), gfx::Size(50, 50), true, false,
                                true);
   root->SetDrawsContent(true);
 
   scoped_ptr<LayerImpl> child = LayerImpl::Create(host_impl.pending_tree(), 2);
@@ skipping 24 matching lines @@
   ASSERT_EQ(1u, render_surface_layer_list.size());
   ASSERT_EQ(1u, root->render_surface()->layer_list().size());
   EXPECT_EQ(1, root->render_surface()->layer_list().at(0)->id());
 }
 
 void EmptyCopyOutputCallback(scoped_ptr<CopyOutputResult> result) {}
 
 TEST_F(LayerTreeHostCommonTest, SubtreeHiddenWithCopyRequest) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_refptr<Layer> root = Layer::Create();
   SetLayerPropertiesForTesting(root.get(),
                                identity_matrix,
                                gfx::Point3F(),
                                gfx::PointF(),
                                gfx::Size(50, 50),
                                true,
@@ skipping 126 matching lines @@
   ASSERT_EQ(2u, copy_layer->render_surface()->layer_list().size());
   EXPECT_EQ(copy_layer->id(),
             copy_layer->render_surface()->layer_list().at(0)->id());
   EXPECT_EQ(copy_child->id(),
             copy_layer->render_surface()->layer_list().at(1)->id());
 }
 
 TEST_F(LayerTreeHostCommonTest, ClippedOutCopyRequest) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_refptr<Layer> root = Layer::Create();
   SetLayerPropertiesForTesting(root.get(),
                                identity_matrix,
                                gfx::Point3F(),
                                gfx::PointF(),
                                gfx::Size(50, 50),
                                true,
@@ skipping 54 matching lines @@
 
   // The root render surface should only have 1 contributing layer, since the
   // other layers are empty/clipped away.
   ASSERT_EQ(1u, root->render_surface()->layer_list().size());
   EXPECT_EQ(root->id(), root->render_surface()->layer_list().at(0)->id());
 }
 
 TEST_F(LayerTreeHostCommonTest, VisibleContentRectInsideSurface) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   const gfx::Transform identity_matrix;
 
   scoped_refptr<Layer> root = Layer::Create();
   SetLayerPropertiesForTesting(root.get(),
                                identity_matrix,
                                gfx::Point3F(),
                                gfx::PointF(),
                                gfx::Size(50, 50),
                                true,
@@ skipping 590 matching lines @@
             render_surface2->render_surface()->content_rect().ToString());
 
   // Sanity check our num_unclipped_descendants values.
   EXPECT_EQ(1, render_surface1->num_unclipped_descendants());
   EXPECT_EQ(0, render_surface2->num_unclipped_descendants());
 }
 
 TEST_F(LayerTreeHostCommonTest, CanRenderToSeparateSurface) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   scoped_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl.active_tree(), 12345);
   scoped_ptr<LayerImpl> child1 =
       LayerImpl::Create(host_impl.active_tree(), 123456);
   scoped_ptr<LayerImpl> child2 =
       LayerImpl::Create(host_impl.active_tree(), 1234567);
   scoped_ptr<LayerImpl> child3 =
       LayerImpl::Create(host_impl.active_tree(), 12345678);
 
   gfx::Transform identity_matrix;
@@ skipping 640 matching lines @@
   // right clip, our render_surface_layer_list's order should be unaffected.
   EXPECT_EQ(3u, render_surface_layer_list.size());
   EXPECT_EQ(root.get(), render_surface_layer_list.at(0));
   EXPECT_EQ(render_surface2.get(), render_surface_layer_list.at(1));
   EXPECT_EQ(render_surface1.get(), render_surface_layer_list.at(2));
   EXPECT_TRUE(render_surface_layer_list.at(0)->render_surface());
   EXPECT_TRUE(render_surface_layer_list.at(1)->render_surface());
   EXPECT_TRUE(render_surface_layer_list.at(2)->render_surface());
 }
 
+TEST_F(LayerTreeHostCommonTest, FixedPositionWithInterveningRenderSurface) {
+  // Ensures that when we have a render surface between a fixed position layer
+  // and its container, we compute the fixed position layer's draw transform
+  // with respect to that intervening render surface, not with respect to its
+  // container's render target.
+  //
+  // + root
+  //   + render_surface
+  //     + fixed
+  //
+  scoped_refptr<Layer> root = Layer::Create();
+  scoped_refptr<LayerWithForcedDrawsContent> render_surface =
+      make_scoped_refptr(new LayerWithForcedDrawsContent());
+  scoped_refptr<LayerWithForcedDrawsContent> fixed =
+      make_scoped_refptr(new LayerWithForcedDrawsContent());
+
+  root->AddChild(render_surface);
+  render_surface->AddChild(fixed);
+
+  root->SetIsContainerForFixedPositionLayers(true);
+  render_surface->SetForceRenderSurface(true);
+
+  LayerPositionConstraint constraint;
+  constraint.set_is_fixed_position(true);
+  fixed->SetPositionConstraint(constraint);
+
+  SetLayerPropertiesForTesting(root.get(), gfx::Transform(), gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(50, 50), true, false);
+  SetLayerPropertiesForTesting(render_surface.get(), gfx::Transform(),
+                               gfx::Point3F(), gfx::PointF(7.f, 9.f),
+                               gfx::Size(50, 50), true, false);
+  SetLayerPropertiesForTesting(fixed.get(), gfx::Transform(), gfx::Point3F(),
+                               gfx::PointF(10.f, 15.f), gfx::Size(50, 50), true,
+                               false);
+
+  scoped_ptr<FakeLayerTreeHost> host(CreateFakeLayerTreeHost());
+  host->SetRootLayer(root);
+
+  ExecuteCalculateDrawProperties(root.get());
+
+  gfx::Transform expected_draw_transform;
+  expected_draw_transform.Translate(10.f, 15.f);
+  EXPECT_EQ(expected_draw_transform, fixed->draw_transform());
+
+  gfx::Transform expected_screen_space_transform;
+  expected_screen_space_transform.Translate(17.f, 24.f);
+  EXPECT_EQ(expected_screen_space_transform, fixed->screen_space_transform());
+}
+
 TEST_F(LayerTreeHostCommonTest, ScrollCompensationWithRounding) {
   // This test verifies that a scrolling layer that gets snapped to
   // integer coordinates doesn't move a fixed position child.
   //
   // + root
   //   + container
   //     + scroller
   //       + fixed
   //
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
   scoped_ptr<LayerImpl> container =
       LayerImpl::Create(host_impl.active_tree(), 2);
   LayerImpl* container_layer = container.get();
   scoped_ptr<LayerImpl> scroller =
       LayerImpl::Create(host_impl.active_tree(), 3);
   LayerImpl* scroll_layer = scroller.get();
   scoped_ptr<LayerImpl> fixed = LayerImpl::Create(host_impl.active_tree(), 4);
   LayerImpl* fixed_layer = fixed.get();
@@ skipping 123 matching lines @@
   // This test verifies that a scrolling layer that has fractional scroll offset
   // from main doesn't move a fixed position child.
   //
   // + root
   //   + container
   //     + scroller
   //       + fixed
   //
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   host_impl.CreatePendingTree();
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
   scoped_ptr<LayerImpl> container =
       LayerImpl::Create(host_impl.active_tree(), 2);
   LayerImpl* container_layer = container.get();
   scoped_ptr<LayerImpl> scroller =
       LayerImpl::Create(host_impl.active_tree(), 3);
   LayerImpl* scroll_layer = scroller.get();
   scoped_ptr<LayerImpl> fixed = LayerImpl::Create(host_impl.active_tree(), 4);
   LayerImpl* fixed_layer = fixed.get();
@@ skipping 73 matching lines @@
   explicit AnimationScaleFactorTrackingLayerImpl(LayerTreeImpl* tree_impl,
                                                  int id)
       : LayerImpl(tree_impl, id) {
     SetDrawsContent(true);
   }
 };
 
 TEST_F(LayerTreeHostCommonTest, MaximumAnimationScaleFactor) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   gfx::Transform identity_matrix;
   scoped_ptr<AnimationScaleFactorTrackingLayerImpl> grand_parent =
       AnimationScaleFactorTrackingLayerImpl::Create(host_impl.active_tree(), 1);
   scoped_ptr<AnimationScaleFactorTrackingLayerImpl> parent =
       AnimationScaleFactorTrackingLayerImpl::Create(host_impl.active_tree(), 2);
   scoped_ptr<AnimationScaleFactorTrackingLayerImpl> child =
       AnimationScaleFactorTrackingLayerImpl::Create(host_impl.active_tree(), 3);
   scoped_ptr<AnimationScaleFactorTrackingLayerImpl> grand_child =
       AnimationScaleFactorTrackingLayerImpl::Create(host_impl.active_tree(), 4);
 
@@ skipping 196 matching lines @@
     if (layer->mask_layer())
       drawn_layers->insert(layer->mask_layer());
     if (layer->replica_layer() && layer->replica_layer()->mask_layer())
       drawn_layers->insert(layer->replica_layer()->mask_layer());
   }
 }
 
 TEST_F(LayerTreeHostCommonTest, RenderSurfaceLayerListMembership) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
   gfx::Transform identity_matrix;
 
   scoped_ptr<LayerImpl> grand_parent =
       LayerImpl::Create(host_impl.active_tree(), 1);
   scoped_ptr<LayerImpl> parent = LayerImpl::Create(host_impl.active_tree(), 3);
   scoped_ptr<LayerImpl> child = LayerImpl::Create(host_impl.active_tree(), 5);
   scoped_ptr<LayerImpl> grand_child1 =
       LayerImpl::Create(host_impl.active_tree(), 7);
   scoped_ptr<LayerImpl> grand_child2 =
       LayerImpl::Create(host_impl.active_tree(), 9);
@@ skipping 222 matching lines @@
   expected.insert(grand_child2_raw);
 
   actual.clear();
   GatherDrawnLayers(render_surface_layer_list_impl(), &actual);
   EXPECT_EQ(expected, actual);
 }
 
 TEST_F(LayerTreeHostCommonTest, DrawPropertyScales) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
 
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
   LayerImpl* root_layer = root.get();
   scoped_ptr<LayerImpl> child1 = LayerImpl::Create(host_impl.active_tree(), 2);
   LayerImpl* child1_layer = child1.get();
   scoped_ptr<LayerImpl> child2 = LayerImpl::Create(host_impl.active_tree(), 3);
   LayerImpl* child2_layer = child2.get();
 
   root->AddChild(child1.Pass());
   root->AddChild(child2.Pass());
@@ skipping 259 matching lines @@
   EXPECT_EQ(gfx::Rect(768 / 2, 582 / 2), root->visible_content_rect());
 
   // Layers drawing to a child render surface should still have their visible
   // content rect clipped by the viewport.
   EXPECT_EQ(gfx::Rect(768 / 2, 582 / 2), content->visible_content_rect());
 }
 
 TEST_F(LayerTreeHostCommonTest, BoundsDeltaAffectVisibleContentRect) {
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager, nullptr);
 
   // Set two layers: the root layer clips it's child,
   // the child draws its content.
 
   gfx::Size root_size = gfx::Size(300, 500);
 
   // Sublayer should be bigger than the root enlarged by bounds_delta.
   gfx::Size sublayer_size = gfx::Size(300, 1000);
 
   // Device viewport accomidated the root and the top controls.
@@ skipping 198 matching lines @@
   rotated->AddChild(surface);
   surface->AddChild(container);
   surface->AddChild(box);
 
   scoped_ptr<FakeLayerTreeHost> host(CreateFakeLayerTreeHost());
   host->SetRootLayer(root);
 
   ExecuteCalculateDrawProperties(root.get());
 }
 
+TEST_F(LayerTreeHostCommonTest, OnlyApplyFixedPositioningOnce) {
+  gfx::Transform identity;
+  gfx::Transform translate_z;
+  translate_z.Translate3d(0, 0, 10);
+
+  scoped_refptr<Layer> root = Layer::Create();
+  SetLayerPropertiesForTesting(root.get(), identity, gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(800, 800), true, false);
+  root->SetIsContainerForFixedPositionLayers(true);
+
+  scoped_refptr<Layer> frame_clip = Layer::Create();
+  SetLayerPropertiesForTesting(frame_clip.get(), translate_z, gfx::Point3F(),
+                               gfx::PointF(500, 100), gfx::Size(100, 100), true,
+                               false);
+  frame_clip->SetMasksToBounds(true);
+
+  scoped_refptr<LayerWithForcedDrawsContent> fixed =
+      make_scoped_refptr(new LayerWithForcedDrawsContent());
+  SetLayerPropertiesForTesting(fixed.get(), identity, gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(1000, 1000), true,
+                               false);
+
+  LayerPositionConstraint constraint;
+  constraint.set_is_fixed_position(true);
+  fixed->SetPositionConstraint(constraint);
+
+  root->AddChild(frame_clip);
+  frame_clip->AddChild(fixed);
+
+  scoped_ptr<FakeLayerTreeHost> host(CreateFakeLayerTreeHost());
+  host->SetRootLayer(root);
+
+  ExecuteCalculateDrawProperties(root.get());
+
+  gfx::Rect expected(0, 0, 100, 100);
+  EXPECT_EQ(expected, fixed->visible_rect_from_property_trees());
+}
+
 }  // namespace
 }  // namespace cc