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

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSRotation_h
 #define CSSRotation_h
 
 #include "core/css/cssom/CSSNumericValue.h"
 #include "core/css/cssom/CSSTransformComponent.h"
 
 namespace blink {
 
 class DOMMatrix;
 
+// Represents a rotation value in a CSSTransformValue used for properties like
+// "transform".
+// See CSSRotation.idl for more information about this class.
 class CORE_EXPORT CSSRotation final : public CSSTransformComponent {
   WTF_MAKE_NONCOPYABLE(CSSRotation);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
+  // Constructors defined in the IDL.
   static CSSRotation* Create(const CSSNumericValue* angle_value) {
     return new CSSRotation(angle_value);
   }
-
   static CSSRotation* Create(double x,
                              double y,
                              double z,
                              const CSSNumericValue* angle_value) {
     return new CSSRotation(x, y, z, angle_value);
   }
 
+  // Blink-internal ways of creating CSSRotations.
   static CSSRotation* FromCSSValue(const CSSFunctionValue&);
 
+  // Getters and setters for attributes defined in the IDL.
   // Bindings requires returning non-const pointers. This is safe because
   // CSSNumericValues are immutable.
   CSSNumericValue* angle() const {
     return const_cast<CSSNumericValue*>(angle_.Get());
   }
   double x() const { return x_; }
   double y() const { return y_; }
   double z() const { return z_; }
 
+  // Internal methods - from CSSTransformComponent.
   TransformComponentType GetType() const override {
     return is2d_ ? kRotationType : kRotation3DType;
   }
-
   DOMMatrix* AsMatrix() const override {
     return nullptr;
     // TODO(meade): Implement.
     // return is2d_
     //           ? CSSMatrixComponent::Rotate(
     //              angle_->to(CSSPrimitiveValue::UnitType::kDegrees)->value())
     //           : CSSMatrixComponent::Rotate3d(
     //              angle_->to(CSSPrimitiveValue::UnitType::kDegrees)->value(),
     //                 x_, y_, z_);
   }
-
   CSSFunctionValue* ToCSSValue() const override;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->Trace(angle_);
     CSSTransformComponent::Trace(visitor);
   }
 
  private:
   CSSRotation(const CSSNumericValue* angle)
       : angle_(angle), x_(0), y_(0), z_(1), is2d_(true) {}
 
   CSSRotation(double x, double y, double z, const CSSNumericValue* angle)
       : angle_(angle), x_(x), y_(y), z_(z), is2d_(false) {}
 
   Member<const CSSNumericValue> angle_;
   double x_;
   double y_;
   double z_;
   bool is2d_;
 };
 
 }  // namespace blink
 
 #endif