npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.5.0/bower_components/core-focusable/polymer-mixin.js

+Polymer.mixin2 = function(prototype, mixin) {
+
+  // adds a single mixin to prototype
+
+  if (mixin.mixinPublish) {
+    prototype.publish = prototype.publish || {};
+    Polymer.mixin(prototype.publish, mixin.mixinPublish);
+  }
+
+  if (mixin.mixinDelegates) {
+    prototype.eventDelegates = prototype.eventDelegates || {};
+    for (var e in mixin.mixinDelegates) {
+      if (!prototype.eventDelegates[e]) {
+        prototype.eventDelegates[e] = mixin.mixinDelegates[e];
+      }
+    }
+  }
+
+  if (mixin.mixinObserve) {
+    prototype.observe = prototype.observe || {};
+    for (var o in mixin.mixinObserve) {
+      if (!prototype.observe[o] && !prototype[o + 'Changed']) {
+        prototype.observe[o] = mixin.mixinObserve[o];
+      }
+    }
+  }
+
+  Polymer.mixin(prototype, mixin);
+
+  delete prototype.mixinPublish;
+  delete prototype.mixinDelegates;
+  delete prototype.mixinObserve;
+
+  return prototype;
+};