Propagate browser zoom changes to embedded PDFs.

chrome/browser/resources/pdf/viewport.js

Index: chrome/browser/resources/pdf/viewport.js
diff --git a/chrome/browser/resources/pdf/viewport.js b/chrome/browser/resources/pdf/viewport.js
index 80a5a06ac646bb69e61dcda69a07bfb53a2ea208..a0aa409670f3d35ae7c870839e7cf797ec9f106e 100644
--- a/chrome/browser/resources/pdf/viewport.js
+++ b/chrome/browser/resources/pdf/viewport.js
@@ -54,7 +54,8 @@ function frameToPluginCoordinate(coordinateInFrame) {
  * @param {Function} beforeZoomCallback is run before a change in zoom
  * @param {Function} afterZoomCallback is run after a change in zoom
  * @param {number} scrollbarWidth the width of scrollbars on the page
- * @param {number} defaultZoom The default zoom level.
+ * @param {number} initialZoom The zoom level when the pdf viewer is
+ *     initialized.
  * @param {number} topToolbarHeight The number of pixels that should initially
  *     be left blank above the document for the toolbar.
  */
@@ -64,7 +65,7 @@ function Viewport(window,
                   beforeZoomCallback,
                   afterZoomCallback,
                   scrollbarWidth,
-                  defaultZoom,
+                  initialZoom,
                   topToolbarHeight) {
   this.window_ = window;
   this.sizer_ = sizer;
@@ -77,7 +78,7 @@ function Viewport(window,
   this.pageDimensions_ = [];
   this.scrollbarWidth_ = scrollbarWidth;
   this.fittingType_ = Viewport.FittingType.NONE;
-  this.defaultZoom_ = defaultZoom;
+  this.initialZoom_ = initialZoom;
   this.topToolbarHeight_ = topToolbarHeight;
   this.prevScale_ = 1;
   this.pinchPhase_ = Viewport.PinchPhase.PINCH_NONE;
@@ -728,7 +729,7 @@ Viewport.prototype = {
       this.pageDimensions_ = this.documentDimensions_.pageDimensions;
       if (initialDimensions) {
         this.setZoomInternal_(
-            Math.min(this.defaultZoom_,
+            Math.min(this.initialZoom_,
                      this.computeFittingZoom_(this.documentDimensions_, true)));
         this.position = {
           x: 0,