Refactor screen/monitor so that gfx::Screen returns monitor object.

ash/monitor/monitor_controller.cc

Index: ash/monitor/monitor_controller.cc
diff --git a/ash/monitor/monitor_controller.cc b/ash/monitor/monitor_controller.cc
index 3ebfea4877601869e060c759a113a21eda047e24..5565b6dc8053fe0ed9e0175f7f8b94b34c4a5637 100644
--- a/ash/monitor/monitor_controller.cc
+++ b/ash/monitor/monitor_controller.cc
@@ -13,7 +13,7 @@
 #include "base/stl_util.h"
 #include "base/time.h"
 #include "ui/aura/env.h"
-#include "ui/aura/monitor.h"
+#include "ui/aura/monitor_aura.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 
@@ -46,30 +46,33 @@ MonitorController::MonitorController() {
 MonitorController::~MonitorController() {
   aura::Env::GetInstance()->monitor_manager()->RemoveObserver(this);
   // Remove the root first.
-  aura::Monitor* monitor = Shell::GetRootWindow()->GetProperty(kMonitorKey);
+  aura::MonitorAura* monitor = Shell::GetRootWindow()->GetProperty(kMonitorKey);
   DCHECK(monitor);
   root_windows_.erase(monitor);
   STLDeleteContainerPairSecondPointers(
       root_windows_.begin(), root_windows_.end());
 }
 
-void MonitorController::OnMonitorBoundsChanged(const aura::Monitor* monitor) {
-  root_windows_[monitor]->SetHostBounds(monitor->bounds());
+void MonitorController::OnMonitorBoundsChanged(const gfx::Monitor* monitor) {
+  const aura::MonitorAura* monitor_aura =
+      static_cast<const aura::MonitorAura*>(monitor);
+  root_windows_[monitor]->SetHostBounds(monitor_aura->bounds());
 }
 
-void MonitorController::OnMonitorAdded(aura::Monitor* monitor) {
+void MonitorController::OnMonitorAdded(gfx::Monitor* monitor) {
+  aura::MonitorAura* monitor_aura = static_cast<aura::MonitorAura*>(monitor);
   if (root_windows_.empty()) {
     root_windows_[monitor] = Shell::GetRootWindow();
-    Shell::GetRootWindow()->SetHostBounds(monitor->bounds());
+    Shell::GetRootWindow()->SetHostBounds(monitor_aura->bounds());
     return;
   }
   aura::RootWindow* root = aura::Env::GetInstance()->monitor_manager()->
-      CreateRootWindowForMonitor(monitor);
+      CreateRootWindowForMonitor(monitor_aura);
   root_windows_[monitor] = root;
   SetupAsSecondaryMonitor(root);
 }
 
-void MonitorController::OnMonitorRemoved(const aura::Monitor* monitor) {
+void MonitorController::OnMonitorRemoved(const gfx::Monitor* monitor) {
   aura::RootWindow* root = root_windows_[monitor];
   DCHECK(root);
   // Primary monitor should never be removed by MonitorManager.
@@ -86,8 +89,8 @@ void MonitorController::Init() {
   aura::MonitorManager* monitor_manager =
       aura::Env::GetInstance()->monitor_manager();
   for (size_t i = 0; i < monitor_manager->GetNumMonitors(); ++i) {
-    aura::Monitor* monitor = monitor_manager->GetMonitorAt(i);
-    const aura::Monitor* key = monitor;
+    aura::MonitorAura* monitor = monitor_manager->GetMonitorAt(i);
+    const gfx::Monitor* key = monitor;
     if (i == 0) {
       // Primary monitor
       root_windows_[key] = Shell::GetRootWindow();