Add a global on/off switch for content settings and expose a toggle on the Website Settings options…

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index d2ab104f384f5754ffc11102ccb1e4f12f0fc981..a80312dd3c49d90939d50cd4fefd9a6efa432dd8 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -990,6 +990,10 @@ const char kUseCustomChromeFrame[] = "browser.custom_chrome_frame";
 // Dictionary of content settings applied to all hosts by default.
 const char kDefaultContentSettings[] = "profile.default_content_settings";
 
+// Dictionary of content settings that can globally disallow all hosts by
+// default.
+const char kOverrideContentSettings[] = "profile.override_content_settings";

[Bernhard Bauer, 2014/09/10 09:07:18]

There are some existing prefs/switches for turning individual content settings
off. If we add a new general pref, we should migrate the existing stuff to that.

[Daniel Nishi, 2014/09/10 16:38:29]

Do you know an example of one off the top of your head?

I was able to find the kWebkitPluginsEnabled, kWebkitJavascriptEnabled, and
kGeolocationEnabled (Android-only) so far. 

[Bernhard Bauer, 2014/09/11 16:49:56]

Yeah, those were the ones I had in mind. Although now that I think about it, we
don't actually have UI to change these... 

+
 // Boolean indicating whether the clear on exit pref was migrated to content
 // settings yet.
 const char kContentSettingsClearOnExitMigrated[] =