Import Polymer 0.8 and several key elements.

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

Index: third_party/polymer/v0_8/components/paper-button/bower.json
diff --git a/third_party/polymer/v0_8/components/paper-button/bower.json b/third_party/polymer/v0_8/components/paper-button/bower.json
new file mode 100644
index 0000000000000000000000000000000000000000..9997f3a82695e62fadfc839898f28efcfca0cb25
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+++ b/third_party/polymer/v0_8/components/paper-button/bower.json
@@ -0,0 +1,20 @@
+{
+  "name": "paper-button",
+  "private": true,
+  "dependencies": {
+    "polymer": "polymer/polymer#v0.8.0-rc.7",
+    "paper-ripple": "polymerelements/paper-ripple#^0.8.0",
+    "paper-card": "polymerelements/paper-card#^0.8.0",
+    "paper-behaviors": "polymerelements/paper-behaviors#^0.8.0"
+  },
+  "devDependencies": {
+    "iron-component-page": "polymerelements/iron-component-page#^0.8.0",
+    "test-fixture": "polymerelements/test-fixture#^0.8.0",
+    "iron-icon": "polymerelements/iron-icon#^0.8.0",
+    "iron-icons": "polymerelements/iron-icons#^0.8.0",
+    "iron-test-helpers": "polymerelements/iron-test-helpers#^0.8.0",
+    "paper-styles": "polymerelements/paper-styles#^0.8.0",
+    "webcomponentsjs": "webcomponents/webcomponentsjs#^0.6.0",
+    "web-component-tester": "*"
+  }
+}