Linux: middle-click to navigate

chrome/browser/renderer_host/render_view_host_delegate.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 25 matching lines @@
 struct WebDropData;
 
 namespace base {
 class WaitableEvent;
 }
 
 namespace IPC {
 class Message;
 }
 
+namespace WebKit {
+class WebMouseEvent;
+}
+
 namespace webkit_glue {
 class AutofillForm;
 struct WebApplicationInfo;
 }
 
 //
 // RenderViewHostDelegate
 //
 //  An interface implemented by an object interested in knowing about the state
 //  of the RenderViewHost.
@@ skipping 54 matching lines @@
     // |is_drop_target| is true if the mouse is over a valid drop target.
     virtual void UpdateDragCursor(bool is_drop_target) = 0;
 
     // Notification that view for this delegate got the focus.
     virtual void GotFocus() = 0;
 
     // Callback to inform the browser it should take back focus. If reverse is
     // 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.
     virtual void HandleMouseEvent() = 0;
     virtual void HandleMouseLeave() = 0;
 
     // The content's intrinsic width (prefWidth) changed.
     virtual void UpdatePreferredWidth(int pref_width) = 0;
   };
 
@@ skipping 315 matching lines @@
                            int number_of_matches,
                            const gfx::Rect& selection_rect,
                            int active_match_ordinal,
                            bool final_update) { }
 
   // The RenderView has inserted one css file into page.
   virtual void DidInsertCSS() { }
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_