Use the full LabelButton height for text layout.

ui/views/controls/button/label_button.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 "ui/views/controls/button/label_button.h"
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/animation/throb_animation.h"
@@ skipping 251 matching lines @@
 
   gfx::Rect child_area(GetChildAreaBounds());
   child_area.Inset(GetInsets());
 
   gfx::Size image_size(image_->GetPreferredSize());
   image_size.SetToMin(child_area.size());
 
   // The label takes any remaining width after sizing the image, unless both
   // views are centered. In that case, using the tighter preferred label width
   // avoids wasted space within the label that would look like awkward padding.
-  gfx::Size label_size(child_area.size());
+  // Labels can paint over the full button height, including the border height.
+  gfx::Size label_size(child_area.width(), height());
   if (!image_size.IsEmpty() && !label_size.IsEmpty()) {
     label_size.set_width(
         std::max(child_area.width() - image_size.width() - kSpacing, 0));
     if (adjusted_alignment == gfx::ALIGN_CENTER) {
       // Ensure multi-line labels paired with images use their available width.
       label_size.set_width(
           std::min(label_size.width(), label_->GetPreferredSize().width()));
     }
   }
 
   gfx::Point image_origin(child_area.origin());
   image_origin.Offset(0, (child_area.height() - image_size.height()) / 2);
   if (adjusted_alignment == gfx::ALIGN_CENTER) {
     const int total_width = image_size.width() + label_size.width() +
         ((image_size.width() > 0 && label_size.width() > 0) ? kSpacing : 0);
     image_origin.Offset((child_area.width() - total_width) / 2, 0);
   } else if (adjusted_alignment == gfx::ALIGN_RIGHT) {
     image_origin.Offset(child_area.width() - image_size.width(), 0);
   }
 
-  gfx::Point label_origin(child_area.origin());
+  gfx::Point label_origin(child_area.x(), 0);
   if (!image_size.IsEmpty() && adjusted_alignment != gfx::ALIGN_RIGHT)
     label_origin.set_x(image_origin.x() + image_size.width() + kSpacing);
 
   image_->SetBoundsRect(gfx::Rect(image_origin, image_size));
   label_->SetBoundsRect(gfx::Rect(label_origin, label_size));
 }
 
 const char* LabelButton::GetClassName() const {
   return kViewClassName;
 }
@@ skipping 173 matching lines @@
   GetExtraParams(params);
   return ui::NativeTheme::kHovered;
 }
 
 void LabelButton::ResetCachedPreferredSize() {
   cached_preferred_size_valid_ = false;
   cached_preferred_size_= gfx::Size();
 }
 
 }  // namespace views