Add a scroll offset to PDF documents to account for the top material design toolbar.

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 dfa2d31dde07bfb508bd55551cb4e8d61b3acc0e..4b10b534e3fa4201f4a82749bc0db11da5f54375 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -75,6 +75,12 @@ function shouldIgnoreKeyEvents(activeElement) {
 PDFViewer.MIN_TOOLBAR_OFFSET = 15;
 
 /**
+ * The height of the toolbar along the top of the page. The document will be
+ * shifted down by this much in the viewport.
+ */
+PDFViewer.MATERIAL_TOOLBAR_HEIGHT = 64;
+
+/**
  * Creates a new PDFViewer. There should only be one of these objects per
  * document.
  * @constructor
@@ -143,8 +149,12 @@ function PDFViewer(browserApi) {
   }
   this.plugin_.setAttribute('headers', headers);
 
-  if (this.isMaterial_)
+  if (this.isMaterial_) {
     this.plugin_.setAttribute('is-material', '');
+    this.plugin_.setAttribute('top-toolbar-height',
+                              PDFViewer.MATERIAL_TOOLBAR_HEIGHT);
+    this.viewport_.topToolbarHeight = PDFViewer.MATERIAL_TOOLBAR_HEIGHT;
+  }
 
   if (!this.browserApi_.getStreamInfo().embedded)
     this.plugin_.setAttribute('full-frame', '');