[GeometryInterface] add getBounds function in DOMQaud.

third_party/WebKit/Source/core/dom/DOMQuad.h

Index: third_party/WebKit/Source/core/dom/DOMQuad.h
diff --git a/third_party/WebKit/Source/core/dom/DOMQuad.h b/third_party/WebKit/Source/core/dom/DOMQuad.h
index b2219d10af83c234387489b683dd9f8fe396b69d..dc3e9ba50d2e3b3c1ffc8155d0891a58654d0705 100644
--- a/third_party/WebKit/Source/core/dom/DOMQuad.h
+++ b/third_party/WebKit/Source/core/dom/DOMQuad.h
@@ -14,6 +14,7 @@ namespace blink {
 class DOMPoint;
 class DOMPointInit;
 class DOMQuadInit;
+class DOMRect;
 class DOMRectInit;
 
 class CORE_EXPORT DOMQuad : public GarbageCollected<DOMQuad>,
@@ -33,6 +34,8 @@ class CORE_EXPORT DOMQuad : public GarbageCollected<DOMQuad>,
   DOMPoint* p3() const { return m_p3; }
   DOMPoint* p4() const { return m_p4; }
 
+  DOMRect* getBounds();
+
   ScriptValue toJSONForBinding(ScriptState*) const;
 
   DEFINE_INLINE_TRACE() {
@@ -49,10 +52,17 @@ class CORE_EXPORT DOMQuad : public GarbageCollected<DOMQuad>,
           const DOMPointInit& p4);
   DOMQuad(double x, double y, double width, double height);
 
+  void calculateBounds();
+
   Member<DOMPoint> m_p1;
   Member<DOMPoint> m_p2;
   Member<DOMPoint> m_p3;
   Member<DOMPoint> m_p4;
+
+  double m_left;
+  double m_right;
+  double m_top;
+  double m_bottom;
 };
 
 }  // namespace blink