[Downloads] Add a horizontal material-styled ProgressBar

chrome/android/java/res/values/attrs.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <resources>
     <declare-styleable name="TintedImage">
         <attr name="tint" format="reference|color" />
     </declare-styleable>
 
@@ skipping 39 matching lines @@
     <declare-styleable name="BoundedView">
         <attr name="maxWidth" format="dimension" />
         <attr name="maxHeight" format="dimension" />
     </declare-styleable>
 
     <declare-styleable name="ClipDrawableProgressBar">
         <attr name="progressBarColor" format="reference|color" />
         <attr name="backgroundColor" format="reference|color" />
     </declare-styleable>
 
+    <declare-styleable name="MaterialProgressBar">
+        <attr name="colorBackground" format="reference|color" />
+        <attr name="colorProgress" format="reference|color" />
+        <attr name="colorSecondaryProgress" format="reference|color" />
+        <attr name="colorThrobber" format="reference|color" />

[Ian Wen, 2016/12/20 23:17:58]

Try removing this if it is not critical?

Also it would make more sense that we could refer the "dim blue" as the
background, and the "darker blue" as the foreground?

[gone, 2016/12/21 00:54:23]

Dropped the throbber specification; just using a bar colored using colorProgress
on top of the bar that's the background color.

+    </declare-styleable>
+
     <declare-styleable name="RadioButtonWithDescription">
         <attr name="titleText" format="string" />
     </declare-styleable>
 
     <declare-styleable name="TextMessageWithLinkAndIconPreference">
         <!-- Used on a TextMessageWithLinkAndIconPreference that is followed
              by another TextMessageWithLinkAndIconPreference to remove the
              bottom spacing, so that related paragraphs of text are closer
              to each other. -->
         <attr name="noBottomSpacing" format="boolean" />
     </declare-styleable>
 </resources>