Change OnWindowInputEvent to use display_id to find the host and update event root_location in WS.

services/ui/ws/window_tree_unittest.cc

Index: services/ui/ws/window_tree_unittest.cc
diff --git a/services/ui/ws/window_tree_unittest.cc b/services/ui/ws/window_tree_unittest.cc
index 2fef45ed1fed5241c241d3bfa1509d1d5e305203..63edbf4e47631b359ef23df32a9b285cb5f1c548 100644
--- a/services/ui/ws/window_tree_unittest.cc
+++ b/services/ui/ws/window_tree_unittest.cc
@@ -288,7 +288,7 @@ TEST_F(WindowTreeTest, FocusOnPointer) {
   EXPECT_EQ(child1, display()->GetFocusedWindow());
   ASSERT_EQ(1u, wm_client()->tracker()->changes()->size())
       << SingleChangeToDescription(*wm_client()->tracker()->changes());
-  EXPECT_EQ("InputEvent window=0,3 event_action=16",
+  EXPECT_EQ("InputEvent window=0,3 event_action=16 event_root_location=61,22",
             ChangesToDescription1(*wm_client()->tracker()->changes())[0]);
   EXPECT_TRUE(tree1_client->tracker()->changes()->empty());
 }
@@ -309,7 +309,7 @@ TEST_F(WindowTreeTest, BasicInputEventTarget) {
   ASSERT_EQ(2u, embed_client->tracker()->changes()->size());
   EXPECT_EQ("Focused id=2,1",
             ChangesToDescription1(*embed_client->tracker()->changes())[0]);
-  EXPECT_EQ("InputEvent window=2,1 event_action=16",
+  EXPECT_EQ("InputEvent window=2,1 event_action=16 event_root_location=21,22",
             ChangesToDescription1(*embed_client->tracker()->changes())[1]);
 }
 
@@ -425,8 +425,10 @@ TEST_F(WindowTreeTest, StartPointerWatcherSendsOnce) {
   // watcher.
   DispatchEventAndAckImmediately(pointer_up);
   ASSERT_EQ(1u, client->tracker()->changes()->size());
-  EXPECT_EQ("InputEvent window=2,1 event_action=18 matches_pointer_watcher",
-            SingleChangeToDescription(*client->tracker()->changes()));
+  EXPECT_EQ(
+      "InputEvent window=2,1 event_action=18 matches_pointer_watcher"
+      " event_root_location=25,25",
+      SingleChangeToDescription(*client->tracker()->changes()));
 }
 
 // Tests that events generated by user A are not watched by pointer watchers
@@ -648,7 +650,7 @@ TEST_F(WindowTreeTest, EventAck) {
   wm_client()->tracker()->changes()->clear();
   DispatchEventWithoutAck(CreateMouseMoveEvent(21, 22));
   ASSERT_EQ(1u, wm_client()->tracker()->changes()->size());
-  EXPECT_EQ("InputEvent window=0,3 event_action=17",
+  EXPECT_EQ("InputEvent window=0,3 event_action=17 event_root_location=21,22",
             ChangesToDescription1(*wm_client()->tracker()->changes())[0]);
   wm_client()->tracker()->changes()->clear();
 
@@ -659,7 +661,7 @@ TEST_F(WindowTreeTest, EventAck) {
   // Ack the first event. That should trigger the dispatch of the second event.
   AckPreviousEvent();
   ASSERT_EQ(1u, wm_client()->tracker()->changes()->size());
-  EXPECT_EQ("InputEvent window=0,3 event_action=17",
+  EXPECT_EQ("InputEvent window=0,3 event_action=17 event_root_location=21,22",
             ChangesToDescription1(*wm_client()->tracker()->changes())[0]);
 }