Mac Support for drag-and-drop tests that start dragging via mouse simulation.

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
diff --git a/content/public/test/browser_test_utils.h b/content/public/test/browser_test_utils.h
index b4908997a25f3e6506b2f5f0565b50febfa9b730..927ee15e1e3c7721d75bdb2a788a0c274df25cdf 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -27,6 +27,7 @@
 #include "content/public/common/page_type.h"
 #include "ipc/message_filter.h"
 #include "storage/common/fileapi/file_system_types.h"
+#include "third_party/WebKit/public/platform/WebDragOperation.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "third_party/WebKit/public/platform/WebMouseEvent.h"
 #include "ui/accessibility/ax_node_data.h"
@@ -760,6 +761,15 @@ class PwnMessageHelper {
   DISALLOW_COPY_AND_ASSIGN(PwnMessageHelper);
 };
 
+// DragStartCallback should return |true| if the callback handled the drag start
+// request and wants to suppress passing the drag start request to the OS layer.
+// Otherwise (to continue handling the drag start request as usual), return
+// false.
+using DragStartCallback =
+    base::Callback<bool(const DropData& drop_data,
+                        blink::WebDragOperationsMask drag_operations_mask)>;
+void RegisterDragStartCallback(DragStartCallback callback);
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_