Add UMA/Telemetry stats for end-to-end scroll latency

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/strings/string16.h"
@@ skipping 291 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(display_name)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::BrowserRenderingStats)
   IPC_STRUCT_TRAITS_MEMBER(input_event_count)
   IPC_STRUCT_TRAITS_MEMBER(total_input_latency)
   IPC_STRUCT_TRAITS_MEMBER(touch_ui_count)
   IPC_STRUCT_TRAITS_MEMBER(total_touch_ui_latency)
   IPC_STRUCT_TRAITS_MEMBER(touch_acked_count)
   IPC_STRUCT_TRAITS_MEMBER(total_touch_acked_latency)
+  IPC_STRUCT_TRAITS_MEMBER(scroll_update_count)
+  IPC_STRUCT_TRAITS_MEMBER(total_scroll_update_latency)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_BEGIN(ViewHostMsg_CreateWindow_Params)
   // Routing ID of the view initiating the open.
   IPC_STRUCT_MEMBER(int, opener_id)
 
   // True if this open request came in the context of a user gesture.
   IPC_STRUCT_MEMBER(bool, user_gesture)
 
   // Type of window requested.
@@ skipping 2010 matching lines @@
 // synchronously (see crbug.com/120597). This IPC message sends the character
 // bounds after every composition change to always have correct bound info.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ImeCompositionRangeChanged,
                     ui::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.