Show "displays" section in the options page even for 1 display. It happens in case of mirroring.

chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc

Index: chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
diff --git a/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
index 46656e00c5a1901ef692a88a4bd1480980222175..3a38278e825c094bf1862ab3b7dd592c05f0ab9f 100644
--- a/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
+++ b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
@@ -81,13 +81,10 @@ void DisplayOptionsHandler::OnDisplayRemoved(const gfx::Display& old_display) {
 }
 
 void DisplayOptionsHandler::UpdateDisplaySectionVisibility() {
-  aura::DisplayManager* display_manager =
-      aura::Env::GetInstance()->display_manager();
   chromeos::State output_state =
       ash::Shell::GetInstance()->output_configurator()->output_state();
   base::FundamentalValue show_options(
       DisplayController::IsExtendedDesktopEnabled() &&
-      display_manager->GetNumDisplays() > 1 &&
       output_state != chromeos::STATE_INVALID &&
       output_state != chromeos::STATE_HEADLESS &&
       output_state != chromeos::STATE_SINGLE);

[oshima, 2012/07/25 07:53:41]

I think it's easier to read/follow if you list valid cases like

output_state == chromeos::STATE_DUAL_MIRROR || ..

rather than opposite.

[Jun Mukai, 2012/07/25 08:14:43]

Are there no chances to add a new state even when we want to support >2
displays?  I was just afraid to forget keeping the consistency in that case.

[oshima, 2012/07/25 13:03:37]

Existing code can break when state enum changes too. How about adding
int OutputConfigurator::GetNumPhisicalDisplays() and use it instead?

[Jun Mukai, 2012/07/25 14:44:42]

Can we do that in another CL?  That doesn't sound so relevant to this CL
description.