Add Linux support for getting the thumbnail and wire into the switcher.

chrome/browser/views/tabs/tab_overview_cell.cc

 // Copyright (c) 2009 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/views/tabs/tab_overview_cell.h"
 
 #include "app/gfx/favicon_size.h"
 #include "base/string_util.h"
+#include "skia/ext/image_operations.h"
 #include "views/border.h"
 #include "views/controls/image_view.h"
 #include "views/controls/label.h"
 #include "views/grid_layout.h"
 
 using views::ColumnSet;
 using views::GridLayout;
 
 // Padding between the favicon and label.
 static const int kFavIconPadding = 4;
@@ skipping 38 matching lines @@
   layout->AddView(thumbnail_view_);
 
   thumbnail_view_->set_background(
       views::Background::CreateSolidBackground(SK_ColorWHITE));
 
   thumbnail_view_->set_border(
       views::Border::CreateSolidBorder(1, SkColorSetRGB(176, 176, 176)));
 }
 
 void TabOverviewCell::SetThumbnail(const SkBitmap& thumbnail) {
-  thumbnail_view_->SetImage(thumbnail);
+  // Do mipmapped-based resampling to get closer to the correct size. The
+  // input bitmap isn't guaranteed to have any specific resolution.
+  thumbnail_view_->SetImage(skia::ImageOperations::DownsampleByTwoUntilSize(
+      thumbnail, kThumbnailWidth, kThumbnailHeight));
 }
 
 void TabOverviewCell::SetTitle(const string16& title) {
   title_label_->SetText(UTF16ToWide(title));
 }
 
 void TabOverviewCell::SetFavIcon(const SkBitmap& favicon) {
   fav_icon_view_->SetImage(favicon);
 }
 
 bool TabOverviewCell::IsPointInThumbnail(const gfx::Point& point) {
   return thumbnail_view_->bounds().Contains(point);
 }
 
 gfx::Size TabOverviewCell::GetPreferredSize() {
   if (!preferred_size_.IsEmpty())
     return preferred_size_;
 
   // Force the preferred width to that of the thumbnail.
   gfx::Size thumbnail_pref = thumbnail_view_->GetPreferredSize();
   gfx::Size pref = View::GetPreferredSize();
   pref.set_width(thumbnail_pref.width());
   return pref;
 }