aura: Fix a couple of tooltip related bugs:

1. Position tooltips correctly when they are out of screen bounds
2. Hide tooltips when lockscreen is shown

BUG=112121,110128
TEST=manual


Review URL: http://codereview.chromium.org/9310008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120086 0039d316-1c4b-4281-b951-d872f2087c98

ash/shell/lock_view.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/shell/example_factory.h"
+#include "ash/tooltips/tooltip_controller.h"
 #include "base/utf_string_conversions.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -68,6 +69,9 @@ void CreateLockScreen() {
   widget->SetContentsView(lock_view);
   widget->Show();
   widget->GetNativeView()->SetName("LockView");
+
+  Shell::GetInstance()->tooltip_controller()->UpdateTooltip(
+      widget->GetNativeView());
 }
 
 }  // namespace shell

ash/tooltips/tooltip_controller.cc

@@ -191,6 +191,19 @@ class TooltipController::Tooltip {
     tooltip_rect.Offset(kCursorOffsetX, kCursorOffsetY);
     gfx::Rect monitor_bounds =
         gfx::Screen::GetMonitorAreaNearestPoint(tooltip_rect.origin());
+
+    // If tooltip is out of bounds on the x axis, we simply shift it
+    // horizontally by the offset.
+    if (tooltip_rect.right() > monitor_bounds.right()) {
+      int h_offset = tooltip_rect.right() - monitor_bounds.right();
+      tooltip_rect.Offset(-h_offset, 0);
+    }
+
+    // If tooltip is out of bounds on the y axis, we flip it to appear above the
+    // mouse cursor instead of below.
+    if (tooltip_rect.bottom() > monitor_bounds.bottom())
+      tooltip_rect.set_y(mouse_pos.y() - tooltip_height);
+
     widget_->SetBounds(tooltip_rect.AdjustToFit(monitor_bounds));
   }