Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/paper-behaviors/paper-button-behavior-extracted.js

Index: third_party/polymer/v0_8/components-chromium/paper-behaviors/paper-button-behavior-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/paper-behaviors/paper-button-behavior-extracted.js b/third_party/polymer/v0_8/components-chromium/paper-behaviors/paper-button-behavior-extracted.js
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index 0000000000000000000000000000000000000000..9c0fade69a2b8f186aaca687f98f09113897cccc
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+++ b/third_party/polymer/v0_8/components-chromium/paper-behaviors/paper-button-behavior-extracted.js
@@ -0,0 +1,32 @@
+
+
+  Polymer.PaperButtonElevation = {
+
+    properties: {
+
+      _elevation: {
+        type: Number
+      }
+
+    },
+
+    _calculateElevation: function() {
+      var e = 1;
+      if (this.disabled || !this.raised) {
+        e = 0;
+      } else if (this.active || this.pressed) {
+        e = 2;
+      } else if (this.focused) {
+        e = 3;
+      }
+      this._elevation = e;
+    }
+
+  };
+
+  Polymer.PaperButtonBehavior = [
+    Polymer.IronControlState,
+    Polymer.IronButtonState,
+    Polymer.PaperButtonElevation
+  ];
+