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

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 222 matching lines @@
   }
 
   for (const auto& custom_data_item : drop_data.custom_data) {
     metadata.push_back(DropData::Metadata::CreateForMimeType(
         DropData::Kind::STRING, custom_data_item.first));
   }
 
   return metadata;
 }
 
+base::LazyInstance<RenderWidgetHostImpl::DragStartCallback>::Leaky
+    g_drag_start_callback_for_testing = LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostImpl
 
 RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
                                            RenderProcessHost* process,
                                            int32_t routing_id,
                                            bool hidden)
     : renderer_initialized_(false),
@@ skipping 1242 matching lines @@
   if (delegate_)
     delegate_->FocusedNodeTouched(editable);
 }
 
 void RenderWidgetHostImpl::OnStartDragging(
     const DropData& drop_data,
     blink::WebDragOperationsMask drag_operations_mask,
     const SkBitmap& bitmap,
     const gfx::Vector2d& bitmap_offset_in_dip,
     const DragEventSourceInfo& event_info) {
+  bool drag_start_handled_by_test = false;
+  if (!g_drag_start_callback_for_testing.Get().is_null()) {
+    drag_start_handled_by_test = g_drag_start_callback_for_testing.Get().Run(
+        drop_data, drag_operations_mask);
+  }
+
   RenderViewHostDelegateView* view = delegate_->GetDelegateView();
-  if (!view) {
+  if (!view || drag_start_handled_by_test) {
     // Need to clear drag and drop state in blink.
     DragSourceSystemDragEnded();
     return;
   }
 
   DropData filtered_data(drop_data);
   RenderProcessHost* process = GetProcess();
   ChildProcessSecurityPolicyImpl* policy =
       ChildProcessSecurityPolicyImpl::GetInstance();
 
@@ skipping 1006 matching lines @@
     // Note: We are using the origin URL provided by the sender here. It may be
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
     file_system_file.filesystem_id = filesystem_id;
   }
 }
 
+// static
+void RenderWidgetHostImpl::RegisterDragStartCallbackForTesting(
+    DragStartCallback callback) {
+  // Prevent attempts to register more than one callback.
+  DCHECK(callback.is_null() ||
+         g_drag_start_callback_for_testing.Get().is_null());
+
+  g_drag_start_callback_for_testing.Get() = std::move(callback);
+}
+
 }  // namespace content