[Typed OM] Add comments and consistent structure to all the CSSTransformComponent subclasses

third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h

Index: third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h b/third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h
index f607337dc58b7d0058ace3c5a961f50242e701a0..ebc67eaf34e896ba93533a60800622de75ee3913 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h
+++ b/third_party/WebKit/Source/core/css/cssom/CSSTransformComponent.h
@@ -14,6 +14,10 @@ namespace blink {
 
 class DOMMatrix;
 
+// CSSTransformComponent is the base class used for the representations of
+// the individual CSS transforms. They are combined in a CSSTransformValue
+// before they can be used as a value for properties like "transform".
+// See CSSTransformComponent.idl for more information about this class.
 class CORE_EXPORT CSSTransformComponent
     : public GarbageCollectedFinalized<CSSTransformComponent>,
       public ScriptWrappable {
@@ -34,22 +38,13 @@ class CORE_EXPORT CSSTransformComponent
     kTranslation3DType
   };
 
-  static CSSTransformComponent* FromCSSValue(const CSSValue&);
-
-  static bool Is2DComponentType(TransformComponentType transform_type) {
-    return transform_type != kMatrix3DType &&
-           transform_type != kPerspectiveType &&
-           transform_type != kRotation3DType &&
-           transform_type != kScale3DType &&
-           transform_type != kTranslation3DType;
-  }
-
   virtual ~CSSTransformComponent() {}
 
-  virtual TransformComponentType GetType() const = 0;
+  // Blink-internal ways of creating CSSTransformComponents.
+  static CSSTransformComponent* FromCSSValue(const CSSValue&);
 
+  // Getters and setters for attributes defined in the IDL.
   bool is2D() const { return Is2DComponentType(GetType()); }
-
   virtual String toString() const {
     const CSSValue* result = ToCSSValue();
     // TODO(meade): Remove this once all the number and length types are
@@ -57,12 +52,22 @@ class CORE_EXPORT CSSTransformComponent
     return result ? result->CssText() : "";
   }
 
+  // Internal methods.
+  virtual TransformComponentType GetType() const = 0;
   virtual CSSFunctionValue* ToCSSValue() const = 0;
   virtual DOMMatrix* AsMatrix() const = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 
  protected:
+  static bool Is2DComponentType(TransformComponentType transform_type) {
+    return transform_type != kMatrix3DType &&
+           transform_type != kPerspectiveType &&
+           transform_type != kRotation3DType &&
+           transform_type != kScale3DType &&
+           transform_type != kTranslation3DType;
+  }
+
   CSSTransformComponent() = default;
 };