Let input tag filter out non-native files in dropped data.

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 9922972e925b2faf9ce06daf72a423bef758ea09..bc4eb153004acc128c1832636c02f526c1a3f00f 100644
--- a/Source/core/page/DragController.cpp
+++ b/Source/core/page/DragController.cpp
@@ -54,6 +54,7 @@
 #include "core/html/HTMLFormElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLPlugInElement.h"
+#include "core/html/forms/FileInputType.h"

[tkent, 2014/11/17 05:21:37]

Please do not include FileInputType.h here.  *InputType.h should be used only in
HTMLInputElement.
Probably getAcceptableDropFileNames() should be a function of DragController.

[hirono, 2014/11/17 05:59:25]

Done.

 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
 #include "core/page/DragClient.h"
@@ -385,16 +386,18 @@ bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction a
         dragSession.mouseIsOverFileInput = m_fileInputElementUnderMouse;
         dragSession.numberOfItemsToBeAccepted = 0;
 
-        unsigned numberOfFiles = dragData->numberOfFiles();
+        Vector<String> paths;
+        FileInputType::getAcceptableDropFileNames(*dragData, &paths);
+        const unsigned numberOfFiles = paths.size();
         if (m_fileInputElementUnderMouse) {
             if (m_fileInputElementUnderMouse->isDisabledFormControl())
                 dragSession.numberOfItemsToBeAccepted = 0;
             else if (m_fileInputElementUnderMouse->multiple())
                 dragSession.numberOfItemsToBeAccepted = numberOfFiles;
-            else if (numberOfFiles > 1)
-                dragSession.numberOfItemsToBeAccepted = 0;
-            else
+            else if (numberOfFiles == 1)
                 dragSession.numberOfItemsToBeAccepted = 1;
+            else
+                dragSession.numberOfItemsToBeAccepted = 0;
 
             if (!dragSession.numberOfItemsToBeAccepted)
                 dragSession.operation = DragOperationNone;