Fix some unit tests that fail when we enable impl property trees

cc/layers/layer_position_constraint_unittest.cc

Index: cc/layers/layer_position_constraint_unittest.cc
diff --git a/cc/layers/layer_position_constraint_unittest.cc b/cc/layers/layer_position_constraint_unittest.cc
index 594dac220a9667c2cf02747cceab8b9c772c422e..9c15a650845eaade892de270accff15a87ee65d9 100644
--- a/cc/layers/layer_position_constraint_unittest.cc
+++ b/cc/layers/layer_position_constraint_unittest.cc
@@ -224,6 +224,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 2: scroll delta of 10, 10
   child_impl_->SetScrollDelta(gfx::Vector2d(10, 10));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   // Here the child is affected by scroll delta, but the fixed position
@@ -277,6 +278,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: scroll delta of 0, 0
   child_impl_->SetScrollDelta(gfx::Vector2d(0, 0));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_child_transform;
@@ -361,6 +363,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: scroll delta of 0, 0
   child_impl_->SetScrollDelta(gfx::Vector2d(0, 0));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_child_transform;
@@ -451,6 +454,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 2: scroll delta of 10, 30
   child_impl_->SetScrollDelta(gfx::Vector2d(10, 30));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   // Here the grand_child remains unchanged, because it scrolls along with the
@@ -562,6 +566,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: scroll delta of 0, 0
   child_impl_->SetScrollDelta(gfx::Vector2d(0, 0));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_child_transform;
@@ -718,6 +723,7 @@ TEST_F(
 
   // Case 1: scroll delta of 0, 0
   child_impl_->SetScrollDelta(gfx::Vector2d(0, 0));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_child_transform;
@@ -899,6 +905,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: scroll delta of 0, 0
   child_impl_->SetScrollDelta(gfx::Vector2d(0, 0));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_child_transform;
@@ -969,6 +976,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: scrollDelta
   child_impl_->SetScrollDelta(gfx::Vector2d(10, 10));
+  child_impl_->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   // Here the child is affected by scroll delta, but the fixed position
@@ -1033,7 +1041,9 @@ TEST_F(LayerPositionConstraintTest,
   LayerImpl* fixed_to_container2 = container2->children()[0];
 
   container1->SetScrollDelta(gfx::Vector2d(0, 15));
+  container1->SetDrawsContent(true);
   container2->SetScrollDelta(gfx::Vector2d(30, 0));
+  container2->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root_impl_);
 
   gfx::Transform expected_container1_transform;
@@ -1079,6 +1089,7 @@ TEST_F(LayerPositionConstraintTest,
 
   // Case 1: fixed-container size delta of 20, 20
   scroll_layer_impl_->SetScrollDelta(gfx::Vector2d(10, 10));
+  scroll_layer_impl_->SetDrawsContent(true);
   SetFixedContainerSizeDelta(scroll_layer_impl_, gfx::Vector2d(20, 20));
   gfx::Transform expected_scroll_layer_transform;
   expected_scroll_layer_transform.Translate(-10.0, -10.0);