Log the context of the ULS in which no search results were found

Relies on updates to EventLogging schema. Diff:
https://meta.wikimedia.org/w/index.php?title=Schema%3AUniversalLanguageSelector&type=revision&diff=17799034&oldid=7327441

Bug: T179402
Change-Id: I2ff9ce9b40df16ed3c5e6970fb3b691af08cedec

resources/js/ext.uls.compactlinks.js

@@ -190,6 +190,7 @@
 				$trigger.removeClass( 'selector-open' );
 			},
 			languages: ulsLanguageList,
+			ulsPurpose: 'compact-language-links',
 			// Show common languages
 			quickList: self.getCommonLanguages( languages ),
 			noResultsTemplate: function () {

resources/js/ext.uls.displaysettings.js

@@ -356,6 +356,7 @@
 					// the apply button
 					displaySettings.markDirty();
 				},
+				ulsPurpose: 'interface-language',
 				quickList: function () {
 					return mw.uls.getFrequentLanguageList();
 				}

resources/js/ext.uls.eventlogger.js

@@ -237,13 +237,16 @@
 		/**
 		 * Log search strings which produce no search results.
 		 *
-		 * @param {jQuery.event} event The orignal event
+		 * @param {jQuery.event} event The original event
 		 * @param {string} context The query string
+		 * @param {string} ulsPurpose The ulsPurpose option of the ULS panel that triggered the event
 		 */
-		noSearchResults: function ( event, context ) {
+		noSearchResults: function ( event, context, ulsPurpose ) {
 			this.log( {
 				action: 'no-search-results',
-				context: context
+				context: context,
+				ulsPurpose: ulsPurpose,
+				title: mw.config.get( 'wgPageName' )
 			} );
 		}
 	};

resources/js/ext.uls.ime.js

@@ -293,6 +293,7 @@
 						$input.focus();
 					},
 					languages: mw.ime.getLanguagesWithIME(),
+					ulsPurpose: 'ime-selector',
 					top: $input.offset().top
 				} );
 

resources/js/ext.uls.inputsettings.js

@@ -390,7 +390,8 @@
 					inputSettings.prepareLanguages();
 					inputSettings.markDirty();
 				},
-				languages: mw.ime.getLanguagesWithIME()
+				languages: mw.ime.getLanguagesWithIME(),
+				ulsPurpose: 'input-settings'
 			} );
 
 			$moreLanguagesButton.on( 'click', function () {

resources/js/ext.uls.interface.js

@@ -367,7 +367,15 @@
 							},
 							onSelect: function ( language ) {
 								mw.uls.changeLanguage( language );
-							}
+							},
+							// Not actually used on sites with the gear icon
+							// in the interlanguage area, because this ULS
+							// will be a container for other ULS panels.
+							// However, this is used on sites with ULS
+							// in the personal bar, and in that case it has the same
+							// purpose as the selector in Display settings,
+							// so it has the same identifier.
+							ulsPurpose: 'interface-language'
 						} );
 
 						// Allow styles to apply first and position to work by