cc: PushProperties on viewport size change

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 68a1f587aa68dfaec95c50d9588beda55e2a9ac7..b100756a190a03836631b9a636a85deef80b576d 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -475,6 +475,60 @@ class LayerTreeHostTestSetNeedsRedrawRect : public LayerTreeHostTest {
 
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestSetNeedsRedrawRect);
 
+// After a viewport size change, PushProperties must be called a second time.
+class LayerTreeHostTestGpuRasterDeviceSizeChanged : public LayerTreeHostTest {
+ public:
+  LayerTreeHostTestGpuRasterDeviceSizeChanged()
+      : num_draws_(0), bounds_(400, 50), invalid_rect_(10, 10, 20, 20) {}
+
+  void BeginTest() override {
+    root_layer_ = FakePictureLayer::Create(&client_);
+    root_layer_->SetIsDrawable(true);
+    root_layer_->SetBounds(bounds_);
+    layer_tree_host()->SetRootLayer(root_layer_);
+    layer_tree_host()->SetViewportSize(bounds_);
+    PostSetNeedsCommitToMainThread();
+  }
+
+  void InitializeSettings(LayerTreeSettings* settings) override {
+    settings->gpu_rasterization_enabled = true;
+    settings->gpu_rasterization_forced = true;
+  }
+
+  void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
+    // Perform 2 commits.
+    if (!num_draws_) {
+      PostSetNeedsRedrawRectToMainThread(invalid_rect_);
+    } else {
+      EndTest();
+    }
+    num_draws_++;
+  }
+
+  void DidCommitAndDrawFrame() override {
+    // On the second commit, resize the viewport.
+    if (num_draws_ == 1) {
+      gfx::Size bounds2_(500, 60);
+      layer_tree_host()->SetViewportSize(bounds2_);
+    }
+  }
+
+  void AfterTest() override {
+    EXPECT_EQ(2, num_draws_);
+    EXPECT_EQ(2, root_layer_->push_properties_count());
+  }
+
+ private:
+  int num_draws_;
+  const gfx::Size bounds_;
+  const gfx::Rect invalid_rect_;
+  FakeContentLayerClient client_;
+  scoped_refptr<FakePictureLayer> root_layer_;
+};
+
+MULTI_THREAD_DELEGATING_RENDERER_IMPL_TEST_F(
+    LayerTreeHostTestGpuRasterDeviceSizeChanged);
+
 class LayerTreeHostTestNoExtraCommitFromInvalidate : public LayerTreeHostTest {
  public:
   void InitializeSettings(LayerTreeSettings* settings) override {