Switch the background color in PDF Viewer when using Material Design

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index b6d5caa5d35079af211be6911ac116be1d88236d..af1ebea9e52a319d59a9a090e8f3ee867ae01c15 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -90,6 +90,8 @@ function PDFViewer(streamDetails) {
         (window.innerHeight - this.toolbarHeight_) + 'px';
   this.plugin_.style.width = window.innerWidth + 'px';
 
+  this.plugin_.setAttribute('is-material', this.isMaterial_);
+
   // Handle scripting messages from outside the extension that wish to interact
   // with it. We also send a message indicating that extension has loaded and
   // is ready to receive messages.