Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/paper-slider/README.md

Index: third_party/polymer/v1_0/components/paper-slider/README.md
diff --git a/third_party/polymer/v1_0/components/paper-slider/README.md b/third_party/polymer/v1_0/components/paper-slider/README.md
index fd00cd26db5a073a81f83b3a0610a61db579f2c9..bfd50b56c8183ebd8581db2864d7103ed268da14 100644
--- a/third_party/polymer/v1_0/components/paper-slider/README.md
+++ b/third_party/polymer/v1_0/components/paper-slider/README.md
@@ -19,51 +19,31 @@ Use `min` and `max` to specify the slider range. Default is `0` to `100`. For ex
 
 ### Styling slider
 
-To change the slider progress bar color:
-```css
-paper-slider {
-  --paper-slider-active-color: #0f9d58;
-}
-```
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-slider-bar-color` | The background color of the slider | `transparent`
+`--paper-slider-active-color` | The progress bar color | `--google-blue-700`
+`--paper-slider-secondary-color` | The secondary progress bar color | `--google-blue-300`
+`--paper-slider-knob-color` | The knob color | `--google-blue-700`
+`--paper-slider-disabled-knob-color` | The disabled knob color | `--google-grey-500`
+`--paper-slider-pin-color` | The pin color | `--google-blue-700`
+`--paper-slider-font-color` | The pin's text color | `#fff`
+`--paper-slider-disabled-active-color` | The disabled progress bar color | `--google-grey-500`
+`--paper-slider-disabled-secondary-color` | The disabled secondary progress bar color | `--google-grey-300`
 
-To change the slider knob color:
-```css
-paper-slider {
-  --paper-slider-knob-color: #0f9d58;
-}
-```
+Example:
 
-To change the slider pin color:
-```css
-paper-slider {
-  --paper-slider-pin-color: #0f9d58;
-}
 ```
-
-To change the slider pin's font color:
-```css
-paper-slider {
-  --paper-slider-pin-font-color: #0f9d58;
-}
-```
-
-To change the slider secondary progress bar color:
-```css
 paper-slider {
+  --paper-slider-bar-color: #fff;
+  --paper-slider-active-color: #0f9d58;
+  --paper-slider-knob-color: #0f9d58;
+  --paper-slider-pin-color: #0f9d58;
+  --paper-slider-font-color: #0f9d58;
   --paper-slider-secondary-color: #0f9d58;
-}
-```
-
-To change the slider disabled active color:
-```css
-paper-slider {
   --paper-slider-disabled-active-color: #ccc;
-}
-```
-
-To change the slider disabled secondary progress bar color:
-```css
-paper-slider {
   --paper-slider-disabled-secondary-color: #ccc;
 }
-```
+```