Fixed positioning of tooltips in multi monitor setups.

ui/views/corewm/cursor_height_provider_win.h

Index: ui/views/corewm/cursor_height_provider_win.h
diff --git a/ui/views/corewm/cursor_height_provider_win.h b/ui/views/corewm/cursor_height_provider_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..25ba51c185ea6070d893b5878b6add596ce25140
--- /dev/null
+++ b/ui/views/corewm/cursor_height_provider_win.h
@@ -0,0 +1,42 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_COREWM_CURSOR_HEIGHT_PROVIDER_WIN_H_
+#define UI_VIEWS_COREWM_CURSOR_HEIGHT_PROVIDER_WIN_H_
+
+#include <windows.h>
+#include <map>
+
+#include "base/macros.h"
+
+namespace views {
+namespace corewm {
+
+/**

[sky, 2014/04/30 17:22:14]

This isn't Java;) Use // for comments (
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml ).

+ * Provides the information about height of visible mouse cursor.
+ */
+class CursorHeightProvider {
+ public:
+  CursorHeightProvider() {}
+
+  /**
+   * Gets the visible height of current cursor.
+   *
+   * The height is offset between cursor's hot point and it's
+   * bottom edge, derived from first non-transparent row of cursor's mask.
+   */
+  int GetCursorHeight();

[sky, 2014/04/30 17:22:14]

GetCurrentCursorHeight()

+
+ private:
+  typedef std::map<HCURSOR, int> HeightStorage;
+
+  HeightStorage cached_heights_;

[sky, 2014/04/30 17:22:14]

Shouldn't this be shared among instances? In fact is there a reason
GetCurrentCursorHeight() shouldn't just be a standalone function?

[Mateusz Szymański, 2014/05/05 07:34:46]

Come to think about it it should have been a function operating on global
variable. Will adjust that.

+
+  DISALLOW_COPY_AND_ASSIGN(CursorHeightProvider);
+};
+
+}  // namespace corewm
+}  // namespace views
+
+#endif  // UI_VIEWS_COREWM_CURSOR_HEIGHT_PROVIDER_WIN_H_