Log First User Interaction in Page Load Metrics

content/public/browser/render_widget_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 221 matching lines @@
   virtual void AddKeyPressEventCallback(
       const KeyPressEventCallback& callback) = 0;
   virtual void RemoveKeyPressEventCallback(
       const KeyPressEventCallback& callback) = 0;
 
   // Add/remove a callback that can handle all kinds of mouse events.
   typedef base::Callback<bool(const blink::WebMouseEvent&)> MouseEventCallback;
   virtual void AddMouseEventCallback(const MouseEventCallback& callback) = 0;
   virtual void RemoveMouseEventCallback(const MouseEventCallback& callback) = 0;
 
+  // Observer for WebInputEvents (but not input event acks).
+  class InputEventObserver {
+   public:
+    virtual ~InputEventObserver() {}
+
+    virtual void OnInputEvent(const blink::WebInputEvent&) = 0;
+  };
+
+  // Add/remove an input event observer.
+  virtual void AddInputEventObserver(InputEventObserver* observer) = 0;
+  virtual void RemoveInputEventObserver(InputEventObserver* observer) = 0;
+
   // Get the screen info corresponding to this render widget.
   virtual void GetWebScreenInfo(blink::WebScreenInfo* result) = 0;
   // Get the color profile corresponding to this render widget.
   virtual bool GetScreenColorProfile(std::vector<char>* color_profile) = 0;
 
   // Sends a compositor proto to the render widget.
   virtual void HandleCompositorProto(const std::vector<uint8_t>& proto) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_H_