3 files changed, 38 insertions, 4 deletions

diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 67fbdba..f41edf5 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -110,6 +110,15 @@ void Window::Restore() {
   }
 }
 
+gfx::Rect Window::GetScreenBounds() const {
+  const gfx::Rect local_bounds = bounds();
+  gfx::Point origin = local_bounds.origin();
+  Window::ConvertPointToWindow(parent_,
+                               aura::Desktop::GetInstance(),
+                               &origin);
+  return gfx::Rect(origin, local_bounds.size());
+}
+
 void Window::Activate() {
   // If we support minimization need to ensure this restores the window first.
   aura::Desktop::GetInstance()->SetActiveWindow(this, this);
@@ -239,8 +248,8 @@ const Window* Window::GetChildById(int id) const {
 }
 
 // static
-void Window::ConvertPointToWindow(Window* source,
-                                  Window* target,
+void Window::ConvertPointToWindow(const Window* source,
+                                  const Window* target,
                                   gfx::Point* point) {
   ui::Layer::ConvertPointToLayer(source->layer(), target->layer(), point);
 }
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 5084169..57ea1ea 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -97,6 +97,9 @@ class AURA_EXPORT Window : public ui::LayerDelegate {
   // Restore the window to its original bounds.
   void Restore();
 
+  // Returns the window's bounds in screen coordinates.
+  gfx::Rect GetScreenBounds() const;
+
   // Returns the window's show state.
   ui::WindowShowState show_state() const { return show_state_; }
 
@@ -167,8 +170,8 @@ class AURA_EXPORT Window : public ui::LayerDelegate {
   Window* GetChildById(int id);
   const Window* GetChildById(int id) const;
 
-  static void ConvertPointToWindow(Window* source,
-                                   Window* target,
+  static void ConvertPointToWindow(const Window* source,
+                                   const Window* target,
                                    gfx::Point* point);
 
   // Returns the cursor for the specified point, in window coordinates.
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 94233bb..ceacf65 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -161,6 +161,10 @@ class WindowTest : public AuraTestBase {
     return CreateTestWindowWithDelegate(NULL, id, gfx::Rect(), parent);
   }
 
+  Window* CreateTestWindowWithBounds(const gfx::Rect& bounds, Window* parent) {
+    return CreateTestWindowWithDelegate(NULL, 0, bounds, parent);
+  }
+
   Window* CreateTestWindow(SkColor color,
                            int id,
                            const gfx::Rect& bounds,
@@ -432,6 +436,24 @@ TEST_F(WindowTest, ReleaseCaptureOnDestroy) {
   EXPECT_EQ(NULL, desktop->capture_window());
 }
 
+TEST_F(WindowTest, GetScreenBounds) {
+  scoped_ptr<Window> viewport(CreateTestWindowWithBounds(
+      gfx::Rect(0, 0, 300, 300), NULL));
+  scoped_ptr<Window> child(CreateTestWindowWithBounds(
+      gfx::Rect(0, 0, 100, 100), viewport.get()));
+  // Sanity check.
+  EXPECT_EQ("0,0 100x100", child->GetScreenBounds().ToString());
+
+  // The |child| window's screen bounds should move along with the |viewport|.
+  viewport->SetBounds(gfx::Rect(-100, -100, 300, 300));
+  EXPECT_EQ("-100,-100 100x100", child->GetScreenBounds().ToString());
+
+  // The |child| window is moved to the 0,0 in screen coordinates.
+  // |GetScreenBounds()| should return 0,0.
+  child->SetBounds(gfx::Rect(100, 100, 100, 100));
+  EXPECT_EQ("0,0 100x100", child->GetScreenBounds().ToString());
+}
+
 class MouseEnterExitWindowDelegate : public TestWindowDelegate {
  public:
   MouseEnterExitWindowDelegate() : entered_(false), exited_(false) {}