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..3fb61482a5e994149ec83f6ad9d9a90705b18a9a 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
@@ -104,13 +110,16 @@ function PDFViewer(browserApi) {
   this.errorScreen_ = $('error-screen');
 
   // Create the viewport.
+  var topToolbarHeight =
+      this.isMaterial_ ? PDFViewer.MATERIAL_TOOLBAR_HEIGHT : 0;
   this.viewport_ = new Viewport(window,
                                 this.sizer_,
                                 this.viewportChanged_.bind(this),
                                 this.beforeZoom_.bind(this),
                                 this.afterZoom_.bind(this),
                                 getScrollbarWidth(),
-                                this.browserApi_.getDefaultZoom());
+                                this.browserApi_.getDefaultZoom(),
+                                topToolbarHeight);
 
   // Create the plugin object dynamically so we can set its src. The plugin
   // element is sized to fill the entire window and is set to be fixed
@@ -143,8 +152,11 @@ 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);
+  }
 
   if (!this.browserApi_.getStreamInfo().embedded)
     this.plugin_.setAttribute('full-frame', '');