Drop event should generate user gesture.

Source/core/page/DragController.cpp

Index: Source/core/page/DragController.cpp
diff --git a/Source/core/page/DragController.cpp b/Source/core/page/DragController.cpp
index 46cc10ac68d72c386d2dc518a8ae9a8ca2a49562..e0d374aeacf123108ec999f3d9a6166e4514a53a 100644
--- a/Source/core/page/DragController.cpp
+++ b/Source/core/page/DragController.cpp
@@ -68,6 +68,7 @@
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "platform/DragImage.h"
+#include "platform/UserGestureIndicator.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/ImageOrientation.h"
@@ -237,6 +238,8 @@ DragSession DragController::dragUpdated(DragData* dragData)
 bool DragController::performDrag(DragData* dragData)

[abarth-chromium, 2014/03/24 03:51:29]

Are you sure this can't be triggered by script?

[wjywbs, 2014/03/24 12:14:10]

I tried to use script to trigger this function and I added a log, but this
function wasn't run. I believe this is not the code path to dispatch drop event
in script:

var event = document.createEvent("HTMLEvents");
event.initEvent("drop",true,true);
document.getElementById("div1").dispatchEvent(event);

 {
     ASSERT(dragData);
+    UserGestureIndicator gesture(DefinitelyProcessingNewUserGesture);
+
     m_documentUnderMouse = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
     if ((m_dragDestinationAction & DragDestinationActionDHTML) && m_documentIsHandlingDrag) {
         RefPtr<LocalFrame> mainFrame = m_page->mainFrame();