Fix many return-std-move-in-c++11 warnings

Change-Id: Ib0042cf412fe3c5fa600b7ae644d16740457535e
Reviewed-on: https://skia-review.googlesource.com/121354
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/experimental/skottie/Skottie.cpp b/experimental/skottie/Skottie.cpp
index 9c5849f..7486502 100644
--- a/experimental/skottie/Skottie.cpp
+++ b/experimental/skottie/Skottie.cpp
@@ -140,7 +140,7 @@
             opacityNode->setOpacity(o * 0.01f);
         });
 
-    return opacityNode;
+    return std::move(opacityNode);
 }
 
 sk_sp<sksg::RenderNode> AttachComposition(const Json::Value&, AttachContext* ctx);
@@ -182,7 +182,7 @@
         return nullptr;
     }
 
-    return rect_node;
+    return std::move(rect_node);
 }
 
 sk_sp<sksg::GeometryNode> AttachEllipseGeometry(const Json::Value& jellipse, AttachContext* ctx) {
@@ -206,7 +206,7 @@
         return nullptr;
     }
 
-    return rect_node;
+    return std::move(rect_node);
 }
 
 sk_sp<sksg::GeometryNode> AttachPolystarGeometry(const Json::Value& jstar, AttachContext* ctx) {
@@ -255,7 +255,7 @@
             adapter->setRotation(r);
         });
 
-    return path_node;
+    return std::move(path_node);
 }
 
 sk_sp<sksg::Color> AttachColor(const Json::Value& obj, AttachContext* ctx) {
@@ -1112,7 +1112,7 @@
         layerCtx->fCurrentMatte.reset();
     }
 
-    return controller_node;
+    return std::move(controller_node);
 }
 
 sk_sp<sksg::RenderNode> AttachComposition(const Json::Value& comp, AttachContext* ctx) {
@@ -1142,7 +1142,7 @@
         comp_group->addChild(std::move(layers[i]));
     }
 
-    return comp_group;
+    return std::move(comp_group);
 }
 
 } // namespace