draggable=true elements should drag even if shift-key is pressed

third_party/WebKit/Source/core/editing/SelectionController.cpp

Index: third_party/WebKit/Source/core/editing/SelectionController.cpp
diff --git a/third_party/WebKit/Source/core/editing/SelectionController.cpp b/third_party/WebKit/Source/core/editing/SelectionController.cpp
index 75736a6e7713c34ce2d3b098d4fe5694386a7ac6..b9e9be1662646a62751fc309e3afdbb7cb70a81f 100644
--- a/third_party/WebKit/Source/core/editing/SelectionController.cpp
+++ b/third_party/WebKit/Source/core/editing/SelectionController.cpp
@@ -821,9 +821,17 @@ bool isLinkSelection(const MouseEventWithHitTestResults& event) {
 }
 
 bool isExtendingSelection(const MouseEventWithHitTestResults& event) {
+  bool isDraggable = false;
+  Node* innerNode = event.innerNode();
+  if (LayoutObject* layoutObject = innerNode->layoutObject()) {
+    const ComputedStyle& style = layoutObject->styleRef();
+    if (style.userDrag() == DRAG_ELEMENT)
+      isDraggable = true;
+  }
+
   bool isMouseDownOnLinkOrImage =
       event.isOverLink() || event.hitTestResult().image();
-  return event.event().shiftKey() && !isMouseDownOnLinkOrImage;
+  return event.event().shiftKey() && !isMouseDownOnLinkOrImage && !isDraggable;
 }
 
 }  // namespace blink