DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/sdk/CSSMetadata.js

Index: Source/devtools/front_end/sdk/CSSMetadata.js
diff --git a/Source/devtools/front_end/sdk/CSSMetadata.js b/Source/devtools/front_end/sdk/CSSMetadata.js
index 93b220e71462b6f4503af857153d8a29b73bfc3b..c6e0da717fe6f390ef2e0ef2126735fa8ea0e52c 100644
--- a/Source/devtools/front_end/sdk/CSSMetadata.js
+++ b/Source/devtools/front_end/sdk/CSSMetadata.js
@@ -70,11 +70,18 @@ WebInspector.CSSMetadata = function(properties)
  */
 WebInspector.CSSMetadata.cssPropertiesMetainfo = new WebInspector.CSSMetadata([]);
 
+/**
+ * @param {string} propertyName
+ * @return {boolean}
+ */
 WebInspector.CSSMetadata.isColorAwareProperty = function(propertyName)
 {
     return WebInspector.CSSMetadata._colorAwareProperties[propertyName] === true;
 }
 
+/**
+ * @return {!Object.<string, boolean>}
+ */
 WebInspector.CSSMetadata.colors = function()
 {
     if (!WebInspector.CSSMetadata._colorsKeySet)
@@ -729,6 +736,9 @@ WebInspector.CSSMetadata.initializeWithSupportedProperties = function(properties
     WebInspector.CSSMetadata.cssPropertiesMetainfo = new WebInspector.CSSMetadata(properties);
 }
 
+/**
+ * @return {!Object.<string, boolean>}
+ */
 WebInspector.CSSMetadata.cssPropertiesMetainfoKeySet = function()
 {
     if (!WebInspector.CSSMetadata._cssPropertiesMetainfoKeySet)