exo: Initial support for multiple displays in ARC

components/exo/shell_surface.h

Index: components/exo/shell_surface.h
diff --git a/components/exo/shell_surface.h b/components/exo/shell_surface.h
index 74ff30d1f6ff44122b53828e07ff33c83e6d8ddc..a43565da38f122c4cf726e71755a449491f35fc0 100644
--- a/components/exo/shell_surface.h
+++ b/components/exo/shell_surface.h
@@ -45,7 +45,8 @@ class ShellSurface : public SurfaceDelegate,
                      public ash::wm::WindowStateObserver,
                      public aura::WindowObserver,
                      public WMHelper::ActivationObserver,
-                     public WMHelper::AccessibilityObserver {
+                     public WMHelper::AccessibilityObserver,
+                     public WMHelper::DisplayConfigurationObserver {
  public:
   enum class BoundsMode { SHELL, CLIENT, FIXED };
 
@@ -80,6 +81,12 @@ class ShellSurface : public SurfaceDelegate,
     surface_destroyed_callback_ = surface_destroyed_callback;
   }
 
+  // Set the callback to run when the display configuration changed.
+  void set_display_config_changed_callback(
+      const base::Closure& display_config_changed_callback) {
+    display_config_changed_callback_ = display_config_changed_callback;
+  }
+
   // Set the callback to run when the surface state changed.
   using StateChangedCallback =
       base::Callback<void(ash::wm::WindowStateType old_state_type,
@@ -250,6 +257,9 @@ class ShellSurface : public SurfaceDelegate,
   // Overridden from WMHelper::AccessibilityObserver:
   void OnAccessibilityModeChanged() override;
 
+  // Overridden from WMHelper::DisplayConfigurationObserver:
+  void OnDisplayConfigurationChanged() override;
+
   // Overridden from ui::EventHandler:
   void OnKeyEvent(ui::KeyEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
@@ -284,8 +294,12 @@ class ShellSurface : public SurfaceDelegate,
   // determined by |component|.
   void AttemptToStartDrag(int component);
 
+  // Attempt to start a client-driven drag operation.
+  void AttemptToStartClientDrag();
+
   // End current drag operation.
   void EndDrag(bool revert);
+  void EndDrag(aura::Window* window, bool revert);
 
   // Returns true if surface is currently being resized.
   bool IsResizing() const;
@@ -307,6 +321,9 @@ class ShellSurface : public SurfaceDelegate,
   // |pending_shadow_content_bounds_|.
   void UpdateShadow();
 
+  // In the coordinate system of the parent root window.
+  gfx::Point GetMouseLocation() const;
+
   views::Widget* widget_ = nullptr;
   Surface* surface_;
   aura::Window* parent_;
@@ -327,6 +344,7 @@ class ShellSurface : public SurfaceDelegate,
   double pending_scale_ = 1.0;
   base::Closure close_callback_;
   base::Closure surface_destroyed_callback_;
+  base::Closure display_config_changed_callback_;
   StateChangedCallback state_changed_callback_;
   ConfigureCallback configure_callback_;
   ScopedConfigure* scoped_configure_ = nullptr;