From 2bc5b505df1b8a975b10e0f0147e93940796a196 Mon Sep 17 00:00:00 2001
From: Jim Mathies <jmathies@mozilla.com>
Date: Wed, 20 Nov 2013 12:45:43 -0600
Subject: [PATCH] Bug 936567 - Add proper support for apzc scale in browser
 binding utils, fixing up various ui element positioning issues with zoom.
 r=mbrubeck

---
 .../metro/base/content/bindings/browser.xml    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/browser/metro/base/content/bindings/browser.xml b/browser/metro/base/content/bindings/browser.xml
index 95b2c95e453..91b12416640 100644
--- a/browser/metro/base/content/bindings/browser.xml
+++ b/browser/metro/base/content/bindings/browser.xml
@@ -292,6 +292,19 @@
         </body>
       </method>
 
+      <property name="scale">
+        <getter><![CDATA[
+          let cwu = this.contentDocument
+                        .defaultView
+                        .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                        .getInterface(Components.interfaces.nsIDOMWindowUtils);
+          let resx = {}, resy = {};
+          cwu.getResolution(resx, resy);
+          // Resolution set by the apzc and is symmetric.
+          return resx.value;
+        ]]></getter>
+      </property>
+
       <field name="_messageListenerLocal"><![CDATA[
         ({
           self: this,
@@ -609,11 +622,6 @@
            take it into account. This is useless for non-remote browser -->
       <field name="_contentDocumentLeft">0</field>
 
-      <!-- The ratio of device pixels to CSS pixels -->
-      <property name="scale"
-                onget="return 1;"
-                onset="return 1;"/>
-
       <!-- These counters are used to update the cached viewport after they reach a certain
            threshold when scrolling -->
       <field name="_cacheRatioWidth">1</field>