aura: Draw persistent borders around browser windows.

chrome/browser/ui/views/frame/browser_non_client_frame_view_aura.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/views/frame/browser_non_client_frame_view_aura.h"
 
 #include "chrome/browser/ui/views/frame/browser_frame.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "grit/generated_resources.h"  // Accessibility names
 #include "grit/ui_resources.h"
@@ skipping 17 matching lines @@
 namespace {
 // Our window is larger than it appears, as it includes space around the edges
 // where resize handles can appear.
 const int kResizeBorderThickness = 8;
 // The top edge is a little thinner, as it is not draggable for resize.
 const int kTopBorderThickness = 4;
 // Offset between top of non-client frame and top edge of opaque frame
 // background at start of slide-in animation.
 const int kFrameBackgroundTopOffset = 25;
 
+// Width of a persistent border that we show around the window (using
+// FrameBackground), even when the resize border isn't visible.
+const int kPersistentBorderThickness = 2;
+
 // The color used to fill the frame.  Opacity is handled in the layer.
 const SkColor kFrameColor = SK_ColorBLACK;
 // Radius of rounded rectangle corners.
 const int kRoundedRectRadius = 3;
 // Frame border fades in over this range of opacity.
 const double kFrameBorderStartOpacity = 0.2;
 const double kFrameBorderEndOpacity = 0.3;
 // How long the hover animation takes if uninterrupted.
 const int kHoverFadeDurationMs = 250;
 
@@ skipping 246 matching lines @@
       break;
     default:
       break;
   }
   // Always show top edge for the active window so that you can tell which
   // window has focus.
   if (active_window)
     show_top = true;
   gfx::Rect target = bounds();
   // Inset the sides that are not showing.
-  target.Inset((show_left ? 0 : kResizeBorderThickness),
-               (show_top ? 0 : kTopBorderThickness + kFrameBackgroundTopOffset),
-               (show_right ? 0 : kResizeBorderThickness),
-               (show_bottom ? 0 : kResizeBorderThickness));
+  target.Inset(
+      (show_left ? 0 : kResizeBorderThickness - kPersistentBorderThickness),
+      (show_top ? 0 : kTopBorderThickness + kFrameBackgroundTopOffset),
+      (show_right ? 0 : kResizeBorderThickness - kPersistentBorderThickness),
+      (show_bottom ? 0 : kResizeBorderThickness - kPersistentBorderThickness));
   return target;
 }
 
 void BrowserNonClientFrameViewAura::UpdateFrameBackground(bool active_window) {
   gfx::Rect start_bounds = GetFrameBackgroundBounds(HTNOWHERE, active_window);
   gfx::Rect end_bounds =
       GetFrameBackgroundBounds(last_hittest_code_, active_window);
   frame_background_->Configure(start_bounds, end_bounds);
 }
 
@@ skipping 198 matching lines @@
     views::Widget* widget, bool active) {
   // Active windows have different background bounds.
   UpdateFrameBackground(active);
   if (active)
     frame_background_->Show();
   else
     frame_background_->Hide();
   maximize_button_->SetVisible(active);
   close_button_->SetVisible(active);
 }