1 files changed, 25 insertions, 0 deletions
diff --git a/ui/aura/root_window_host_win.cc b/ui/aura/root_window_host_win.cc
index 705cf9a..a4f60b6 100644
--- a/ui/aura/root_window_host_win.cc
+++ b/ui/aura/root_window_host_win.cc
@@ -115,6 +115,7 @@ gfx::Size RootWindowHost::GetNativeScreenSize() {
 RootWindowHostWin::RootWindowHostWin(const gfx::Rect& bounds)
     : root_window_(NULL),
       fullscreen_(false),
+      has_capture_(false),
       saved_window_style_(0),
       saved_window_ex_style_(0) {
   Init(NULL, bounds);
@@ -223,6 +224,20 @@ void RootWindowHostWin::SetCursor(gfx::NativeCursor native_cursor) {
   ::SetCursor(LoadCursor(NULL, cursor_id));
 }
 
+void RootWindowHostWin::SetCapture() {
+  if (!has_capture_) {
+    has_capture_ = true;
+    ::SetCapture(hwnd());
+  }
+}
+
+void RootWindowHostWin::ReleaseCapture() {
+  if (has_capture_) {
+    has_capture_ = false;
+    ::ReleaseCapture();
+  }
+}
+
 void RootWindowHostWin::ShowCursor(bool show) {
   // NOTIMPLEMENTED();
 }
@@ -284,6 +299,16 @@ LRESULT RootWindowHostWin::OnMouseRange(UINT message,
   return 0;
 }
 
+LRESULT RootWindowHostWin::OnCaptureChanged(UINT message,
+                                            WPARAM w_param,
+                                            LPARAM l_param) {
+  if (has_capture_) {
+    has_capture_ = false;
+    root_window_->SetCapture(NULL);
+  }
+  return 0;
+}
+
 void RootWindowHostWin::OnPaint(HDC dc) {
   root_window_->Draw();
   ValidateRect(hwnd(), NULL);