mus: Add EventObserver to allow passively listening to UI events

components/mus/ws/test_change_tracker.cc

 // Copyright 2014 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 "components/mus/ws/test_change_tracker.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 91 matching lines @@
     case CHANGE_TYPE_NODE_VISIBILITY_CHANGED:
       return base::StringPrintf("VisibilityChanged window=%s visible=%s",
                                 WindowIdToString(change.window_id).c_str(),
                                 change.bool_value ? "true" : "false");
 
     case CHANGE_TYPE_NODE_DRAWN_STATE_CHANGED:
       return base::StringPrintf("DrawnStateChanged window=%s drawn=%s",
                                 WindowIdToString(change.window_id).c_str(),
                                 change.bool_value ? "true" : "false");
 
-    case CHANGE_TYPE_INPUT_EVENT:
-      return base::StringPrintf("InputEvent window=%s event_action=%d",
-                                WindowIdToString(change.window_id).c_str(),
-                                change.event_action);
+    case CHANGE_TYPE_INPUT_EVENT: {
+      std::string result = base::StringPrintf(
+          "InputEvent window=%s event_action=%d",
+          WindowIdToString(change.window_id).c_str(), change.event_action);
+      if (change.event_observer_id != 0)
+        base::StringAppendF(&result, " event_observer_id=%u",
+                            change.event_observer_id);
+      return result;
+    }
+
+    case CHANGE_TYPE_EVENT_OBSERVED:
+      return base::StringPrintf(
+          "EventObserved event_action=%d event_observer_id=%u",
+          change.event_action, change.event_observer_id);
 
     case CHANGE_TYPE_PROPERTY_CHANGED:
       return base::StringPrintf("PropertyChanged window=%s key=%s value=%s",
                                 WindowIdToString(change.window_id).c_str(),
                                 change.property_key.c_str(),
                                 change.property_value.c_str());
 
     case CHANGE_TYPE_FOCUSED:
       return base::StringPrintf("Focused id=%s",
                                 WindowIdToString(change.window_id).c_str());
@@ skipping 83 matching lines @@
     test_windows->push_back(WindowDataToTestWindow(data[i]));
 }
 
 Change::Change()
     : type(CHANGE_TYPE_EMBED),
       connection_id(0),
       window_id(0),
       window_id2(0),
       window_id3(0),
       event_action(0),
+      event_observer_id(0u),
       direction(mojom::OrderDirection::ABOVE),
       bool_value(false),
+      float_value(0.f),
+      cursor_id(0),
       change_id(0u) {}
 
 Change::Change(const Change& other) = default;
 
 Change::~Change() {}
 
 TestChangeTracker::TestChangeTracker() : delegate_(NULL) {}
 
 TestChangeTracker::~TestChangeTracker() {}
 
@@ skipping 124 matching lines @@
 void TestChangeTracker::OnWindowParentDrawnStateChanged(Id window_id,
                                                         bool drawn) {
   Change change;
   change.type = CHANGE_TYPE_NODE_DRAWN_STATE_CHANGED;
   change.window_id = window_id;
   change.bool_value = drawn;
   AddChange(change);
 }
 
 void TestChangeTracker::OnWindowInputEvent(Id window_id,
-                                           mojom::EventPtr event) {
+                                           mojom::EventPtr event,
+                                           uint32_t event_observer_id) {
   Change change;
   change.type = CHANGE_TYPE_INPUT_EVENT;
   change.window_id = window_id;
   change.event_action = static_cast<int32_t>(event->action);
+  change.event_observer_id = event_observer_id;
   AddChange(change);
 }
 
+void TestChangeTracker::OnEventObserved(mojom::EventPtr event,
+                                        uint32_t event_observer_id) {
+  Change change;
+  change.type = CHANGE_TYPE_EVENT_OBSERVED;
+  change.event_action = static_cast<int32_t>(event->action);
+  change.event_observer_id = event_observer_id;
+  AddChange(change);
+}
+
 void TestChangeTracker::OnWindowSharedPropertyChanged(Id window_id,
                                                       String name,
                                                       Array<uint8_t> data) {
   Change change;
   change.type = CHANGE_TYPE_PROPERTY_CHANGED;
   change.window_id = window_id;
   change.property_key = name;
   if (data.is_null())
     change.property_value = "NULL";
   else
@@ skipping 57 matching lines @@
 
 std::string TestWindow::ToString2() const {
   return base::StringPrintf(
       "window=%s parent=%s visible=%s", WindowIdToString(window_id).c_str(),
       WindowIdToString(parent_id).c_str(), visible ? "true" : "false");
 }
 
 }  // namespace ws
 
 }  // namespace mus