Unify display ids between Display and PlatformDisplay.

services/ui/ws/platform_display.cc

Index: services/ui/ws/platform_display.cc
diff --git a/services/ui/ws/platform_display.cc b/services/ui/ws/platform_display.cc
index e0fbdafa999eac6618244d2bea625260f8b71363..1939f21fcbfcf8d802166ffb8f736f0319ce19f4 100644
--- a/services/ui/ws/platform_display.cc
+++ b/services/ui/ws/platform_display.cc
@@ -43,6 +43,8 @@ namespace ws {
 // static
 PlatformDisplayFactory* PlatformDisplay::factory_ = nullptr;
 
+PlatformDisplay::PlatformDisplay(int64_t id) : id_(id) {}
+
 // static
 PlatformDisplay* PlatformDisplay::Create(
     const PlatformDisplayInitParams& init_params) {
@@ -54,12 +56,11 @@ PlatformDisplay* PlatformDisplay::Create(
 
 DefaultPlatformDisplay::DefaultPlatformDisplay(
     const PlatformDisplayInitParams& init_params)
-    : display_id_(init_params.display_id),
+    : PlatformDisplay(init_params.display_id),
 #if !defined(OS_ANDROID)
       cursor_loader_(ui::CursorLoader::Create()),
 #endif
-      frame_generator_(new FrameGenerator(this,
-                                          init_params.surfaces_state)) {
+      frame_generator_(new FrameGenerator(this, init_params.surfaces_state)) {
   metrics_.bounds = init_params.display_bounds;
   // TODO(rjkroege): Preserve the display_id when Ozone platform can use it.
 }
@@ -161,10 +162,6 @@ bool DefaultPlatformDisplay::IsFramePending() const {
   return frame_generator_->is_frame_pending();
 }
 
-int64_t DefaultPlatformDisplay::GetDisplayId() const {
-  return display_id_;
-}
-
 gfx::Rect DefaultPlatformDisplay::GetBounds() const {
   return metrics_.bounds;
 }