Unify display ids between Display and PlatformDisplay.

services/ui/ws/test_utils.cc

Index: services/ui/ws/test_utils.cc
diff --git a/services/ui/ws/test_utils.cc b/services/ui/ws/test_utils.cc
index 795954c86a95926fc5f43362cb8633b39560126e..189f1f229f09fae9635e19e657bec3ac89321dbf 100644
--- a/services/ui/ws/test_utils.cc
+++ b/services/ui/ws/test_utils.cc
@@ -27,8 +27,8 @@ namespace {
 // Empty implementation of PlatformDisplay.
 class TestPlatformDisplay : public PlatformDisplay {
  public:
-  explicit TestPlatformDisplay(int32_t* cursor_id_storage)
-      : cursor_id_storage_(cursor_id_storage) {
+  explicit TestPlatformDisplay(int64_t id, int32_t* cursor_id_storage)
+      : PlatformDisplay(id), cursor_id_storage_(cursor_id_storage) {
     display_metrics_.bounds = gfx::Rect(0, 0, 400, 300);
     display_metrics_.device_scale_factor = 1.f;
   }
@@ -59,7 +59,6 @@ class TestPlatformDisplay : public PlatformDisplay {
   bool IsFramePending() const override { return false; }
   void RequestCopyOfOutput(
       std::unique_ptr<cc::CopyOutputRequest> output_request) override {}
-  int64_t GetDisplayId() const override { return 1; }
   gfx::Rect GetBounds() const override { return display_metrics_.bounds; }
 
  private:
@@ -110,7 +109,7 @@ TestPlatformDisplayFactory::TestPlatformDisplayFactory(
 TestPlatformDisplayFactory::~TestPlatformDisplayFactory() {}
 
 PlatformDisplay* TestPlatformDisplayFactory::CreatePlatformDisplay() {
-  return new TestPlatformDisplay(cursor_id_storage_);
+  return new TestPlatformDisplay(next_display_id++, cursor_id_storage_);
 }
 
 // TestFrameGeneratorDelegate -------------------------------------------------