Add shortcuts for zoom, print and saving PDFs.

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 6cc8421484a0f248ca01fd40d30fedeb6ef68a68..2908ba99bd688f9c387b901430007d3f0d265229 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -131,7 +131,6 @@ function load() {
   $('save-button-link').href = streamDetails.originalURL;
   $('print-button').addEventListener('click', print);
 
-
   // Setup keyboard event listeners.
   document.onkeydown = function(e) {
     switch (e.keyCode) {
@@ -164,6 +163,32 @@ function load() {
           e.preventDefault();
         }
         return;
+      case 187:  // +/= key.
+      case 107:  // Numpad + key.
+        if (e.ctrlKey)
+          viewport.zoomIn();
+        return;
+      case 189:  // -/_ key.
+      case 109:  // Numpad - key.
+        if (e.ctrlKey)
+          viewport.zoomOut();
+        return;
+      case 83:  // s key.
+        if (e.ctrlKey) {
+          // Dispatch an event simulating a click so that the <a download ...>
+          // attribute is used.
+          var click = document.createEvent('MouseEvents');

[arv (Not doing code reviews), 2014/02/19 02:15:56]

var click = new MouseEvent('click', {
  bubbles: true,
  cancelable: true
});

...but, can you do $('save-button-link').click();

[raymes, 2014/02/19 03:29:38]

Yep, it works!

+          click.initEvent('click', true, true);
+          $('save-button-link').dispatchEvent(click);
+          e.preventDefault();
+        }
+        return;
+      case 80:  // p key.
+        if (e.ctrlKey) {
+          print();
+          e.preventDefault();
+        }
+        return;
     }
   };
 }