aura: Fix a couple of tooltip related bugs:

ash/tooltips/tooltip_controller.cc

 // 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/tooltips/tooltip_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
@@ skipping 173 matching lines @@
   // and applies the adjusted bounds to the label_.
   void SetTooltipBounds(gfx::Point mouse_pos,
                         int tooltip_width,
                         int tooltip_height) {
     gfx::Rect tooltip_rect(mouse_pos.x(), mouse_pos.y(), tooltip_width,
                            tooltip_height);
 
     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));
   }
 
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 // TooltipController public:
 
 TooltipController::TooltipController()
     : aura::EventFilter(NULL),
@@ skipping 117 matching lines @@
     }
   }
 }
 
 bool TooltipController::IsTooltipVisible() {
   return tooltip_->IsVisible();
 }
 
 }  // namespace internal
 }  // namespace ash