Add touch drag UMA latency metric.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index d50b5584e8889b69d0e88cd982e81536a8151005..420bc9308b49ed140d9e38584baca7dc7492ae55 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1852,6 +1852,12 @@ InputEventAckState RenderWidgetHostImpl::FilterInputEvent(
                : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 }
 
+void RenderWidgetHostImpl::OnForwardEventToRenderer(
+    const blink::WebInputEvent& input_event,
+    ui::LatencyInfo* latency_info) {
+  latency_tracker_.OnForwardEventToRenderer(input_event, latency_info);
+}
+
 void RenderWidgetHostImpl::IncrementInFlightEventCount() {
   increment_in_flight_event_count();
   if (!is_hidden_)
@@ -1891,7 +1897,8 @@ void RenderWidgetHostImpl::DidStopFlinging() {
 void RenderWidgetHostImpl::OnKeyboardEventAck(
       const NativeWebKeyboardEventWithLatencyInfo& event,
       InputEventAckState ack_result) {
-  latency_tracker_.OnInputEventAck(event.event, &event.latency);
+  const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
+  latency_tracker_.OnInputEventAck(event.event, &event.latency, processed);
 
 #if defined(OS_MACOSX)
   if (!is_hidden() && view_ && view_->PostProcessEventForPluginIme(event.event))
@@ -1901,7 +1908,6 @@ void RenderWidgetHostImpl::OnKeyboardEventAck(
   // We only send unprocessed key event upwards if we are not hidden,
   // because the user has moved away from us and no longer expect any effect
   // of this key event.
-  const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
   if (delegate_ && !processed && !is_hidden() && !event.event.skip_in_browser) {
     delegate_->HandleKeyboardEvent(event.event);
 
@@ -1914,13 +1920,17 @@ void RenderWidgetHostImpl::OnKeyboardEventAck(
 void RenderWidgetHostImpl::OnMouseEventAck(
     const MouseEventWithLatencyInfo& mouse_event,
     InputEventAckState ack_result) {
-  latency_tracker_.OnInputEventAck(mouse_event.event, &mouse_event.latency);
+  latency_tracker_.OnInputEventAck(
+      mouse_event.event, &mouse_event.latency,
+      ack_result == INPUT_EVENT_ACK_STATE_CONSUMED);
 }
 
 void RenderWidgetHostImpl::OnWheelEventAck(
     const MouseWheelEventWithLatencyInfo& wheel_event,
     InputEventAckState ack_result) {
-  latency_tracker_.OnInputEventAck(wheel_event.event, &wheel_event.latency);
+  latency_tracker_.OnInputEventAck(
+      wheel_event.event, &wheel_event.latency,
+      ack_result == INPUT_EVENT_ACK_STATE_CONSUMED);
 
   if (!is_hidden() && view_) {
     if (ack_result != INPUT_EVENT_ACK_STATE_CONSUMED &&
@@ -1934,7 +1944,9 @@ void RenderWidgetHostImpl::OnWheelEventAck(
 void RenderWidgetHostImpl::OnGestureEventAck(
     const GestureEventWithLatencyInfo& event,
     InputEventAckState ack_result) {
-  latency_tracker_.OnInputEventAck(event.event, &event.latency);
+  latency_tracker_.OnInputEventAck(
+      event.event, &event.latency,
+      ack_result == INPUT_EVENT_ACK_STATE_CONSUMED);
 
   if (view_)
     view_->GestureEventAck(event.event, ack_result);
@@ -1943,7 +1955,9 @@ void RenderWidgetHostImpl::OnGestureEventAck(
 void RenderWidgetHostImpl::OnTouchEventAck(
     const TouchEventWithLatencyInfo& event,
     InputEventAckState ack_result) {
-  latency_tracker_.OnInputEventAck(event.event, &event.latency);
+  latency_tracker_.OnInputEventAck(
+      event.event, &event.latency,
+      ack_result == INPUT_EVENT_ACK_STATE_CONSUMED);
 
   if (touch_emulator_ &&
       touch_emulator_->HandleTouchEventAck(event.event, ack_result)) {