Add content::RenderWidgetHost::MouseEventCallback

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 7f9a7895e279ea6534a1f9c51605e82e92f860d8..d7e5479b24166de3d073b8a9135f5161a9bf1a46 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1016,6 +1016,12 @@ void RenderWidgetHostImpl::ForwardMouseEventWithLatencyInfo(
     const MouseEventWithLatencyInfo& mouse_event) {
   TRACE_EVENT2("input", "RenderWidgetHostImpl::ForwardMouseEvent",
                "x", mouse_event.event.x, "y", mouse_event.event.y);
+
+  for (size_t i = 0; i < mouse_event_callbacks_.size(); ++i) {
+    if (mouse_event_callbacks_[i].Run(mouse_event.event))
+      return;
+  }
+
   input_router_->SendMouseEvent(mouse_event);
 }
 
@@ -1139,6 +1145,21 @@ void RenderWidgetHostImpl::RemoveKeyPressEventCallback(
   }
 }
 
+void RenderWidgetHostImpl::AddMouseEventCallback(
+    const MouseEventCallback& callback) {
+  mouse_event_callbacks_.push_back(callback);
+}
+
+void RenderWidgetHostImpl::RemoveMouseEventCallback(
+    const MouseEventCallback& callback) {
+  for (size_t i = 0; i < mouse_event_callbacks_.size(); ++i) {
+    if (mouse_event_callbacks_[i].Equals(callback)) {
+      mouse_event_callbacks_.erase(mouse_event_callbacks_.begin() + i);
+      return;
+    }
+  }
+}
+
 void RenderWidgetHostImpl::GetWebScreenInfo(WebKit::WebScreenInfo* result) {
   TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::GetWebScreenInfo");
   if (GetView())