exo: Add tracing for input events.

This traces input event and provide information that could be used to
match events on Android side.

TEST=Locally, confirmed that input events appear in ARC++ tracing tool.
BUG=b:132709527

Change-Id: Ice6e823f7be43db0e832253913c27a810dcca4cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625816
Commit-Queue: Yury Khmel <khmel@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664448}

components/exo/BUILD.gn

@@ -25,6 +25,7 @@ source_set("exo") {
     "display.h",
     "frame_sink_resource_manager.cc",
     "frame_sink_resource_manager.h",
+    "input_trace.h",
     "keyboard_delegate.h",
     "keyboard_device_configuration_delegate.h",
     "keyboard_observer.h",

components/exo/input_trace.h

+// Copyright 2019 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 COMPONENTS_EXO_INPUT_TRACE_H_
+#define COMPONENTS_EXO_INPUT_TRACE_H_
+
+#include "base/time/time.h"
+#include "ui/events/event.h"
+
+#define TRACE_EXO_INPUT_EVENT(event)                                \
+  TRACE_EVENT2("exo", "Input::OnInputEvent", "type", event->type(), \
+               "timestamp",                                         \
+               (event->time_stamp() - base::TimeTicks()).InMicroseconds());
+
+#endif  // COMPONENTS_EXO_INPUT_TRACE_H_

components/exo/keyboard.cc

@@ -9,6 +9,7 @@
 #include "ash/public/cpp/app_types.h"
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "components/exo/input_trace.h"
 #include "components/exo/keyboard_delegate.h"
 #include "components/exo/keyboard_device_configuration_delegate.h"
 #include "components/exo/seat.h"
@@ -231,6 +232,8 @@ void Keyboard::OnKeyEvent(ui::KeyEvent* event) {
   if (event->is_repeat())
     return;
 
+  TRACE_EXO_INPUT_EVENT(event);
+
   // Process reserved accelerators before sending it to client.
   if (ProcessAcceleratorIfReserved(focus_, event)) {
     // Discard a key press event if it's a reserved accelerator and it's

components/exo/pointer.cc

@@ -9,6 +9,7 @@
 #include "ash/public/cpp/shell_window_ids.h"
 #include "base/bind.h"
 #include "base/feature_list.h"
+#include "components/exo/input_trace.h"
 #include "components/exo/pointer_delegate.h"
 #include "components/exo/pointer_gesture_pinch_delegate.h"
 #include "components/exo/relative_pointer_delegate.h"
@@ -322,6 +323,8 @@ void Pointer::OnMouseEvent(ui::MouseEvent* event) {
   if (!focus_surface_)
     return;
 
+  TRACE_EXO_INPUT_EVENT(event);
+
   if (event->IsMouseEvent() &&
       event->type() != ui::ET_MOUSE_EXITED &&
       event->type() != ui::ET_MOUSE_CAPTURE_CHANGED) {
@@ -430,6 +433,8 @@ void Pointer::OnGestureEvent(ui::GestureEvent* event) {
   if (!focus_surface_ || !pinch_delegate_)
     return;
 
+  TRACE_EXO_INPUT_EVENT(event);
+
   switch (event->type()) {
     case ui::ET_GESTURE_PINCH_BEGIN:
       pinch_delegate_->OnPointerPinchBegin(event->unique_touch_event_id(),

components/exo/touch.cc

@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 #include "components/exo/touch.h"
+
+#include "components/exo/input_trace.h"
 #include "components/exo/shell_surface_util.h"
 #include "components/exo/surface.h"
 #include "components/exo/touch_delegate.h"
@@ -78,6 +80,8 @@ void Touch::OnTouchEvent(ui::TouchEvent* event) {
       if (!target)
         return;
 
+      TRACE_EXO_INPUT_EVENT(event);
+
       // If this is the first touch point then target becomes the focus surface
       // until all touch points have been released.
       if (touch_points_.empty()) {
@@ -109,6 +113,9 @@ void Touch::OnTouchEvent(ui::TouchEvent* event) {
       auto it = FindVectorItem(touch_points_, touch_pointer_id);
       if (it == touch_points_.end())
         return;
+
+      TRACE_EXO_INPUT_EVENT(event);
+
       touch_points_.erase(it);
 
       // Reset focus surface if this is the last touch point.
@@ -125,6 +132,8 @@ void Touch::OnTouchEvent(ui::TouchEvent* event) {
       if (it == touch_points_.end())
         return;
 
+      TRACE_EXO_INPUT_EVENT(event);
+
       DCHECK(focus_);
       // Convert location to focus surface coordinate space.
       gfx::PointF location = EventLocationInWindow(event, focus_->window());
@@ -136,6 +145,8 @@ void Touch::OnTouchEvent(ui::TouchEvent* event) {
       if (it == touch_points_.end())
         return;
 
+      TRACE_EXO_INPUT_EVENT(event);
+
       DCHECK(focus_);
       focus_->RemoveSurfaceObserver(this);
       focus_ = nullptr;