[third_party] add polymer 1.2.3

polymer_1.2.3/paper-behaviors/README.md

Index: polymer_1.2.3/paper-behaviors/README.md
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+<!---
+
+This README is automatically generated from the comments in these files:
+paper-button-behavior.html  paper-checked-element-behavior.html  paper-inky-focus-behavior.html  paper-ripple-behavior.html
+
+Edit those files, and our readme bot will duplicate them over here!
+Edit this file, and the bot will squash your changes :)
+
+-->
+
+[![Build Status](https://travis-ci.org/PolymerElements/paper-behaviors.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-behaviors)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-behaviors)_
+
+
+<!-- No docs for Polymer.PaperButtonBehavior found. -->
+
+##Polymer.PaperRippleBehavior
+
+
+`Polymer.PaperRippleBehavior` dynamically implements a ripple
+when the element has focus via pointer or keyboard.
+
+NOTE: This behavior is intended to be used in conjunction with and after
+`Polymer.IronButtonState` and `Polymer.IronControlState`.
+
+
+
+##Polymer.PaperCheckedElementBehavior
+
+
+Use `Polymer.PaperCheckedElementBehavior` to implement a custom element
+that has a `checked` property similar to `Polymer.IronCheckedElementBehavior`
+and is compatible with having a ripple effect.
+
+
+##Polymer.PaperInkyFocusBehavior
+
+
+`Polymer.PaperInkyFocusBehavior` implements a ripple when the element has keyboard focus.
+
+