Allow extensions to pin tabs:...

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
===================================================================
--- chrome/common/extensions/api/extension_api.json	(revision 28937)
+++ chrome/common/extensions/api/extension_api.json	(working copy)
@@ -337,6 +337,7 @@
           "index": {"type": "integer", "minimum": 0, "description": "The zero-based index of the tab within its window."},
           "windowId": {"type": "integer", "minimum": 0, "description": "The ID of the window the tab is contained within."},
           "selected": {"type": "boolean", "description": "Whether the tab is selected."},
+          "pinned": {"type": "boolean", "description": "Whether the tab is pinned."},
           "url": {"type": "string", "description": "The URL the tab is displaying."},
           "title": {"type": "string", "optional": true, "description": "The title of the tab. This may not be available if the tab is loading."},
           "favIconUrl": {"type": "string", "optional": true, "description": "The URL of the tab's favicon. This may not be available if the tab is loading."},
@@ -460,6 +461,11 @@
                 "type": "boolean",
                 "optional": true,
                 "description": "Whether the tab should become the selected tab in the window. Defaults to <var>true</var>"
+              },
+              "pinned": {
+                "type": "boolean",
+                "optional": true,
+                "description": "Whether the tab should become pinned."
               }
             }
           },
@@ -488,7 +494,8 @@
             "name": "updateProperties",
             "properties": {
               "url": {"type": "string", "optional": true},
-              "selected": {"type": "boolean", "optional": true}
+              "selected": {"type": "boolean", "optional": true},
+              "pinned": {"type": "boolean", "optional": true}
             }
           },
           {