Enable <adview> tag for packaged apps.

chrome/common/extensions/permissions/api_permission.cc

Index: chrome/common/extensions/permissions/api_permission.cc
diff --git a/chrome/common/extensions/permissions/api_permission.cc b/chrome/common/extensions/permissions/api_permission.cc
index 78a861ee077ef2941c0cf7a01c27c0184721e881..929b54cd3a7269338221b3a93c2f4610954c1703 100644
--- a/chrome/common/extensions/permissions/api_permission.cc
+++ b/chrome/common/extensions/permissions/api_permission.cc
@@ -195,6 +195,7 @@ void APIPermissionInfo::RegisterAllPermissions(
 
     // Register extension permissions.
     { APIPermission::kActiveTab, "activeTab" },
+    { APIPermission::kAdView, "adview", kFlagCannotBeOptional },

[asargent_no_longer_on_chrome, 2013/03/09 00:51:05]

Any reason not to let this be an optional permission? 

In case you aren't familiar with optional permissions, they are described here:

https://developer.chrome.com/extensions/permissions.html

[rpaquay, 2013/03/12 19:56:48]

<webview> is non optional too. Reading the link above, I would probably argue
that ads should be non-optional too: It makes the developer's life slightly more
difficult, and it is not clear to me it would be a good user experience to
display a "Confirm permission dialog" just before an ad is displayed. It sounds
a bit intrusive.

[asargent_no_longer_on_chrome, 2013/03/12 20:54:27]

Note that the *developer* gets to choose if the permission is required or
optional. Listing a permission under the 'permissions' key of their manifest
makes it required, and listing it in the 'optional_permissions' key makes it
optional. Also, the permission request is only a one-time thing if the user
agrees to it, then the system remembers that (I think it's stored in
ExtensionPrefs). 

Anyhow, I don't think this is a big deal either way, and  I wouldn't expect many
developers to choose to make ads optional. 

[rpaquay, 2013/03/12 23:05:36]

Oh I see, I missed that part, sorry. I think you are right then, we should leave
the possibility of making the permission optional.

     { APIPermission::kAlarms, "alarms" },
     { APIPermission::kBookmark, "bookmarks", kFlagNone,
       IDS_EXTENSION_PROMPT_WARNING_BOOKMARKS,