Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/paper-checkbox/bower.json

Index: third_party/polymer/v0_8/components/paper-checkbox/bower.json
diff --git a/third_party/polymer/v0_8/components/paper-checkbox/bower.json b/third_party/polymer/v0_8/components/paper-checkbox/bower.json
new file mode 100644
index 0000000000000000000000000000000000000000..4f1f986ae599c6d5a9695377f92e90bfcc284302
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+++ b/third_party/polymer/v0_8/components/paper-checkbox/bower.json
@@ -0,0 +1,34 @@
+{
+  "name": "paper-checkbox",
+  "version": "0.8.0",
+  "authors": [
+    "The Polymer Authors"
+  ],
+  "keywords": [
+    "web-components",
+    "web-component",
+    "polymer"
+  ],
+  "main": "index.html",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/PolymerElements/paper-checkbox"
+  },
+  "license": "MIT",
+  "homepage": "https://github.com/PolymerElements/paper-checkbox",
+  "ignore": [
+  ],
+  "devDependencies": {
+    "webcomponentsjs": "webcomponents/webcomponentsjs#~0.6.1",
+    "web-component-tester": "Polymer/web-component-tester#^2.2.3",
+    "iron-doc-viewer": "PolymerElements/iron-doc-viewer#^0.8.0",
+    "test-fixture": "PolymerElements/test-fixture#^0.8.0",
+    "iron-test-helpers": "PolymerElements/iron-test-helpers#^0.8.0"
+  },
+  "dependencies": {
+    "polymer": "polymer/polymer#v0.8.0-rc.7",
+    "paper-ripple": "PolymerElements/paper-ripple#^0.8.0",
+    "paper-styles": "PolymerElements/paper-styles#^0.8.0"
+  }
+}