cc: Set requires high res upon becoming visible

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 80f250ebe892e4891561617886e7e0e4b063a96d..a5ec7d09b0d188485a2df0251a0aeca0203eb351 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -5740,6 +5740,25 @@ TEST_F(LayerTreeHostImplTest, MemoryPolicy) {
   EXPECT_EQ(nothing_cutoff_value, current_priority_cutoff_value_);
 }
 
+TEST_F(LayerTreeHostImplTest, RequireHighResWhenVisible) {
+  ASSERT_TRUE(host_impl_->active_tree());
+
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(false);
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(true);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(false);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+
+  host_impl_->CreatePendingTree();
+  host_impl_->ActivatePendingTree();
+
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(true);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+}
+
 class LayerTreeHostImplTestManageTiles : public LayerTreeHostImplTest {
  public:
   virtual void SetUp() OVERRIDE {