Merge revision 1070 changes:

- Linux: Fix drag/drop crash in WebCore::DragData::modifierKeyState (issue #875).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1364@1071 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef1/libcef/web_drop_target_gtk.cc

@@ -83,6 +83,7 @@ WebDropTarget::WebDropTarget(CefBrowserImpl* browser)
     : browser_(browser),
       data_requests_(0),
       context_(NULL),
+      sent_drag_enter_(false),
       method_factory_(this) {
   GtkWidget* widget = browser->UIT_GetWebViewHost()->view_handle();
   gtk_drag_dest_set(widget, (GtkDestDefaults)0, NULL, 0,
@@ -148,6 +149,10 @@ void WebDropTarget::OnDragLeave(GtkWidget* widget, GdkDragContext* context,
   context_ = NULL;
   drop_data_.reset();
 
+  // Don't send the drag leave if we didn't send the drag enter.
+  if (!sent_drag_enter_)
+    return;
+
   // Sometimes we get a drag-leave event before getting a drag-data-received
   // event. In that case, we don't want to bother the renderer with a
   // DragLeave event.
@@ -258,6 +263,7 @@ void WebDropTarget::OnDragDataReceived(GtkWidget* widget,
         if (handler->OnDragEnter(browser_, data,
                 (cef_drag_operations_mask_t)_mask(context))) {
           operation = WebDragOperationNone;
+          sent_drag_enter_ = false;
           gdk_drag_status(context,
               (GdkDragAction)DragDropTypes::DragOperationToGdkDragAction(
                   operation),
@@ -270,6 +276,7 @@ void WebDropTarget::OnDragDataReceived(GtkWidget* widget,
     gtk_widget_translate_coordinates(gtk_widget_get_toplevel(widget), widget,
         x, y, &widget_x, &widget_y);
     WebView* webview = getView();
+    sent_drag_enter_ = true;
     operation = webview->dragTargetDragEnter(drop_data_->ToDragData(),
                                    WebPoint(x, y),
                                    WebPoint(widget_x, widget_y),

cef1/libcef/web_drop_target_gtk.h

@@ -45,6 +45,7 @@ class WebDropTarget : public base::RefCounted<WebDropTarget> {
   bool entered_;
   int data_requests_;
   GdkDragContext* context_;
+  bool sent_drag_enter_;
   base::WeakPtrFactory<WebDropTarget> method_factory_;
 };