Add null check to fill, stroke, clip method

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index c0ded9f381a1fb7f5838c1167e908c1a00eae83b..9707f9a2e3cc298eee4f138b0cd6b3b0a9e842ff 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -932,8 +932,18 @@ void CanvasRenderingContext2D::fill(const String& windingRuleString)
     fillInternal(m_path, windingRuleString);
 }
 
-void CanvasRenderingContext2D::fill(DOMPath* domPath, const String& windingRuleString)
+void CanvasRenderingContext2D::fill(DOMPath* domPath, ExceptionState& exceptionState)
 {
+    fill(domPath, "nonzero", exceptionState);
+}
+
+void CanvasRenderingContext2D::fill(DOMPath* domPath, const String& windingRuleString, ExceptionState& exceptionState)
+{
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     fillInternal(domPath->path(), windingRuleString);
 }
 
@@ -970,8 +980,13 @@ void CanvasRenderingContext2D::stroke()
     strokeInternal(m_path);
 }
 
-void CanvasRenderingContext2D::stroke(DOMPath* domPath)
+void CanvasRenderingContext2D::stroke(DOMPath* domPath, ExceptionState& exceptionState)
 {
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     strokeInternal(domPath->path());
 }
 
@@ -999,8 +1014,18 @@ void CanvasRenderingContext2D::clip(const String& windingRuleString)
     clipInternal(m_path, windingRuleString);
 }
 
-void CanvasRenderingContext2D::clip(DOMPath* domPath, const String& windingRuleString)
+void CanvasRenderingContext2D::clip(DOMPath* domPath, ExceptionState& exceptionState)
+{
+    clip(domPath, "nonzero", exceptionState);
+}
+
+void CanvasRenderingContext2D::clip(DOMPath* domPath, const String& windingRuleString, ExceptionState& exceptionState)
 {
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     clipInternal(domPath->path(), windingRuleString);
 }