MD Settings: handle zoom as floats to fix ghost zoom level issue

chrome/common/extensions/api/settings_private.idl

Index: chrome/common/extensions/api/settings_private.idl
diff --git a/chrome/common/extensions/api/settings_private.idl b/chrome/common/extensions/api/settings_private.idl
index 815cf61082a5f8798700d55394e38d3dd94ddffc..287f1d1fedb5ee9d85a22d38e2a4ef0dc870c454 100644
--- a/chrome/common/extensions/api/settings_private.idl
+++ b/chrome/common/extensions/api/settings_private.idl
@@ -57,7 +57,7 @@ namespace settingsPrivate {
   callback OnPrefSetCallback = void (boolean success);
   callback GetAllPrefsCallback = void (PrefObject[] prefs);
   callback GetPrefCallback = void (PrefObject pref);
-  callback GetDefaultZoomPercentCallback = void (long percent);
+  callback GetDefaultZoomPercentCallback = void (double percent);
   callback SetDefaultZoomPercentCallback = void (boolean success);
 
   interface Functions {
@@ -79,7 +79,7 @@ namespace settingsPrivate {
     static void getDefaultZoomPercent(GetDefaultZoomPercentCallback callback);
 
     // Sets the page zoom factor from a zoom percentage.
-    static void setDefaultZoomPercent(long percent,
+    static void setDefaultZoomPercent(double percent,

[michaelpg, 2016/10/17 08:46:08]

that is not how percents work... a percent would be 110% not 1.1

this function and the above are now misleadingly named

[Devlin, 2016/10/17 14:51:12]

+1

         optional SetDefaultZoomPercentCallback callback);
   };