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

third_party/polymer/v1_0/components-chromium/paper-progress/README.md

Index: third_party/polymer/v1_0/components-chromium/paper-progress/README.md
diff --git a/third_party/polymer/v1_0/components-chromium/paper-progress/README.md b/third_party/polymer/v1_0/components-chromium/paper-progress/README.md
index 7aaf060be3e054feeda4fb6774e3441577dd2c20..edc309f09252ee380e631491191f19b54c9d408c 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-progress/README.md
+++ b/third_party/polymer/v1_0/components-chromium/paper-progress/README.md
@@ -17,10 +17,10 @@ progress, such as the buffer level during a streaming playback progress bar.
 Example:
 
 ```html
-<paper-progress value="10" secondaryProgress="30"></paper-progress>
+<paper-progress value="10" secondary-progress="30"></paper-progress>
 ```
 
-Styling progress bar:
+### Styling progress bar:
 
 To change the active progress bar color:
 
@@ -45,3 +45,14 @@ paper-progress {
   --paper-progress-container-color: #64ffda;
 }
 ```
+
+Add the class `transiting` to a `<paper-progress>` to animate the progress bar when
+the value changed. You can also customize the transition:
+
+```css
+paper-progress {
+  --paper-progress-transition-duration: 0.08s;
+  --paper-progress-transition-timing-function: ease;
+  --paper-progress-transition-transition-delay: 0s;
+}
+```