Add touch drag UMA latency metric.

content/browser/renderer_host/input/mock_input_router_client.cc

 // Copyright 2013 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.
 
 #include "content/browser/renderer_host/input/mock_input_router_client.h"
 
 #include "content/browser/renderer_host/input/input_router.h"
 #include "content/common/input/input_event.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 19 matching lines @@
 MockInputRouterClient::~MockInputRouterClient() {}
 
 InputEventAckState MockInputRouterClient::FilterInputEvent(
     const WebInputEvent& input_event,
     const ui::LatencyInfo& latency_info) {
   filter_input_event_called_ = true;
   last_filter_event_.reset(new InputEvent(input_event, latency_info));
   return filter_state_;
 }
 
+void MockInputRouterClient::OnForwardEventToRenderer(
+    const blink::WebInputEvent& event,
+    ui::LatencyInfo* latency) {
+}
+
 void MockInputRouterClient::IncrementInFlightEventCount() {
   ++in_flight_event_count_;
 }
 
 void MockInputRouterClient::DecrementInFlightEventCount() {
   --in_flight_event_count_;
 }
 
 void MockInputRouterClient::OnHasTouchEventHandlers(
     bool has_handlers)  {
@@ skipping 23 matching lines @@
   return did_flush_called_count;
 }
 
 DidOverscrollParams MockInputRouterClient::GetAndResetOverscroll() {
   DidOverscrollParams overscroll;
   std::swap(overscroll_, overscroll);
   return overscroll;
 }
 
 }  // namespace content