Change cc::ElementId to be a uint64_t

cc/trees/layer_tree_host_unittest_damage.cc

Index: cc/trees/layer_tree_host_unittest_damage.cc
diff --git a/cc/trees/layer_tree_host_unittest_damage.cc b/cc/trees/layer_tree_host_unittest_damage.cc
index 578324f785eeb3b37d145b3cb40d0b4259a6908f..54273b699b13ec6c40b2227e508cc42612db5d85 100644
--- a/cc/trees/layer_tree_host_unittest_damage.cc
+++ b/cc/trees/layer_tree_host_unittest_damage.cc
@@ -341,8 +341,7 @@ class LayerTreeHostScrollbarDamageTest : public LayerTreeHostDamageTest {
 
     scoped_refptr<Layer> scroll_clip_layer = Layer::Create();
     content_layer_ = FakePictureLayer::Create(&client_);
-    content_layer_->SetElementId(
-        LayerIdToElementIdForTesting(content_layer_->id()));
+    content_layer_->SetElementId(ElementId(content_layer_->id()));

[suzyh_UTC10 (ex-contributor), 2017/05/05 04:27:30]

Another possibly unnecessary ElementId call?

[chrishtr, 2017/05/05 05:34:52]

Fixed.

     content_layer_->SetScrollClipLayerId(scroll_clip_layer->id());
     content_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
     content_layer_->SetBounds(gfx::Size(100, 200));