Canvas2d: fix event.region being null on mouseleave/out events

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
index 3c4d22d77d64dfeea4888b54bcb968b0bb3e4ae2..906002445120ea876aa4f6a536fea58f73442dfe 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
@@ -605,6 +605,16 @@ std::pair<Element*, String> CanvasRenderingContext2D::getControlAndIdIfHitRegion
     return std::make_pair(nullptr, String());
 }
 
+String CanvasRenderingContext2D::getIdFromControl(const Element* element)
+{
+    if (hitRegionsCount() <= 0)
+        return String();
+
+    if (HitRegion* hitRegion = m_hitRegionManager->getHitRegionByControl(element))
+        return hitRegion->id();
+    return String();
+}
+
 String CanvasRenderingContext2D::textAlign() const
 {
     return textAlignName(state().getTextAlign());