MonitorManager to manage multiple monitors.

ash/wm/workspace/workspace_manager.h

Index: ash/wm/workspace/workspace_manager.h
diff --git a/ash/wm/workspace/workspace_manager.h b/ash/wm/workspace/workspace_manager.h
index 00715cd9fe37c139efdb7b81e5a1f004983f694e..13d2d94661d81fc17624210d4c3669e0a7bfeb37 100644
--- a/ash/wm/workspace/workspace_manager.h
+++ b/ash/wm/workspace/workspace_manager.h
@@ -63,8 +63,8 @@ class ASH_EXPORT WorkspaceManager {
   // Sets the size of a single workspace (all workspaces have the same size).
   void SetWorkspaceSize(const gfx::Size& workspace_size);
 
-  // Called when screen work area insets changes.
-  void OnScreenWorkAreaInsetsChanged();
+  // Called when monitor's work area insets changes.
+  void OnMonitorWorkAreaInsetsChanged();
 
   // Returns the window the layout manager should allow the size to be set for.
   // TODO: maybe this should be set on WorkspaceLayoutManager.
@@ -123,7 +123,7 @@ class ASH_EXPORT WorkspaceManager {
   void SetActiveWorkspace(Workspace* workspace);
 
   // Returns the bounds of the work area.
-  gfx::Rect GetWorkAreaBounds();
+  gfx::Rect GetWorkAreaBounds() const;
 
   // Returns the index of the workspace that contains the |window|.
   int GetWorkspaceIndexContaining(aura::Window* window) const;