Expand and split DisplayController mojom.

services/ui/display/platform_screen_ozone.cc

Index: services/ui/display/platform_screen_ozone.cc
diff --git a/services/ui/display/platform_screen_ozone.cc b/services/ui/display/platform_screen_ozone.cc
index 7032ed26d61c001ae6266f7fd1f581d35c677844..22aef84ef3644b9687a92424c4e3331f7c390260 100644
--- a/services/ui/display/platform_screen_ozone.cc
+++ b/services/ui/display/platform_screen_ozone.cc
@@ -73,6 +73,8 @@ void PlatformScreenOzone::Init(PlatformScreenDelegate* delegate) {
   std::unique_ptr<ui::NativeDisplayDelegate> native_display_delegate =
       ui::OzonePlatform::GetInstance()->CreateNativeDisplayDelegate();
 
+  // The FakeDisplayController gives us a way to make the NativeDisplayDelegate
+  // pretend something display related has happened.
   if (!base::SysInfo::IsRunningOnChromeOS()) {
     fake_display_controller_ =
         native_display_delegate->GetFakeDisplayController();
@@ -103,7 +105,7 @@ int64_t PlatformScreenOzone::GetPrimaryDisplayId() const {
   return primary_display_id_;
 }
 
-void PlatformScreenOzone::ToggleVirtualDisplay() {
+void PlatformScreenOzone::ToggleAddRemoveDisplay() {
   if (!fake_display_controller_ || wait_for_display_config_update_)
     return;
 
@@ -120,6 +122,45 @@ void PlatformScreenOzone::ToggleVirtualDisplay() {
   }
 }
 
+void PlatformScreenOzone::SwapPrimaryDisplay() {
+  const size_t num_displays = cached_displays_.size();
+  if (num_displays <= 1)
+    return;
+
+  // Find index of current primary display.
+  size_t primary_display_index = 0;
+  for (size_t i = 0; i < num_displays; i++) {
+    if (cached_displays_[i].id == primary_display_id_) {
+      primary_display_index = i;
+      break;
+    }
+  }
+
+  // Set next display index as primary, or loop back to first display if last.
+  if (primary_display_index + 1 == num_displays) {
+    primary_display_id_ = cached_displays_[0].id;
+  } else {
+    primary_display_id_ = cached_displays_[primary_display_index + 1].id;
+  }
+
+  // TODO(kylechar): Update ws::DisplayManager.
+}
+
+void PlatformScreenOzone::SetDisplayWorkArea(int64_t display_id,
+                                             const gfx::Size& size,
+                                             const gfx::Insets& insets) {
+  CachedDisplayIterator iter = GetCachedDisplayIterator(display_id);
+  if (iter == cached_displays_.end()) {
+    NOTREACHED() << display_id;
+    return;
+  }
+
+  DisplayInfo& display_info = *iter;
+  if (display_info.bounds.size() == size) {
+    // TODO(kylechar): Change workarea and update ws::DisplayManager.
+  }
+}
+
 void PlatformScreenOzone::ProcessRemovedDisplays(
     const ui::DisplayConfigurator::DisplayStateList& snapshots) {
   std::vector<int64_t> current_ids;