Linux: middle-click to navigate

chrome/browser/renderer_host/render_view_host_delegate.h

Index: chrome/browser/renderer_host/render_view_host_delegate.h
diff --git a/chrome/browser/renderer_host/render_view_host_delegate.h b/chrome/browser/renderer_host/render_view_host_delegate.h
index fd52627370d409c05356b2625eb5eaca35c602d7..58785afc3c0e9cc3f49fbe5646bc0fbb13ac1009 100644
--- a/chrome/browser/renderer_host/render_view_host_delegate.h
+++ b/chrome/browser/renderer_host/render_view_host_delegate.h
@@ -43,6 +43,10 @@ namespace IPC {
 class Message;
 }
 
+namespace WebKit {
+class WebMouseEvent;
+}
+
 namespace webkit_glue {
 class AutofillForm;
 struct WebApplicationInfo;
@@ -117,10 +121,14 @@ class RenderViewHostDelegate {
     // true, it means the focus was retrieved by doing a Shift-Tab.
     virtual void TakeFocus(bool reverse) = 0;
 
-    // Callback to inform the browser that the renderer did not process the
+    // Callbacks to inform the browser that the renderer did not process the
     // specified events. This gives an opportunity to the browser to process the
-    // event (used for keyboard shortcuts).
+    // event.
+
+    // used for keyboard shortcuts).
     virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) = 0;
+    // used for middle-click to navigate
+    virtual void HandleMouseButtonEvent(const WebKit::WebMouseEvent* event) { }
 
     // Notifications about mouse events in this view.  This is useful for
     // implementing global 'on hover' features external to the view.