DevTools: Support inplace formatting for snippets.

Source/devtools/front_end/InplaceFormatterEditorAction.js

Index: Source/devtools/front_end/InplaceFormatterEditorAction.js
diff --git a/Source/devtools/front_end/InplaceFormatterEditorAction.js b/Source/devtools/front_end/InplaceFormatterEditorAction.js
index 7a21020c9c7b71e4ed57bde4079182b2ccaec80d..fa0013bdc5c4be852442d8e024f1800d723d92ae 100644
--- a/Source/devtools/front_end/InplaceFormatterEditorAction.js
+++ b/Source/devtools/front_end/InplaceFormatterEditorAction.js
@@ -66,7 +66,10 @@ WebInspector.InplaceFormatterEditorAction.prototype = {
      */
     _isFormattable: function(uiSourceCode)
     {
-        return !!uiSourceCode && uiSourceCode.contentType() === WebInspector.resourceTypes.Stylesheet;
+        if (!uiSourceCode)
+            return false;
+        return uiSourceCode.contentType() === WebInspector.resourceTypes.Stylesheet
+            || uiSourceCode.project().type() === WebInspector.projectTypes.Snippets;
     },
 
     _formatSourceInPlace: function()