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

chrome/browser/views/tabs/tab_overview_controller.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_controller.h"
 
 #include "chrome/browser/browser.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/gtk/browser_window_gtk.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tab_contents/thumbnail_generator.h"
 #include "chrome/browser/views/tabs/tab_overview_cell.h"
 #include "chrome/browser/views/tabs/tab_overview_container.h"
 #include "chrome/browser/views/tabs/tab_overview_grid.h"
 #include "chrome/browser/views/tabs/tab_overview_types.h"
 #include "chrome/browser/window_sizer.h"
 #include "views/widget/root_view.h"
 #include "views/widget/widget_gtk.h"
 
 // Horizontal padding from the edge of the monitor to the overview.
 static int kMonitorPadding = 20;
@@ skipping 80 matching lines @@
   if (host_->IsVisible())
     return;
 
   shown_ = true;
   DCHECK(model());  // The model needs to be set before showing.
   host_->Show();
 }
 
 void TabOverviewController::ConfigureCell(TabOverviewCell* cell,
                                           TabContents* contents) {
-  // TODO: need to set thumbnail here.
   if (contents) {
     cell->SetTitle(contents->GetTitle());
     cell->SetFavIcon(contents->GetFavIcon());
+
+    ThumbnailGenerator* generator = g_browser_process->GetThumbnailGenerator();
+    cell->SetThumbnail(
+        generator->GetThumbnailForRenderer(contents->render_view_host()));
+
     cell->SchedulePaint();
   } else {
     // Need to figure out under what circumstances this is null and deal.
     NOTIMPLEMENTED();
   }
 }
 
 void TabOverviewController::DragStarted() {
   DCHECK(!drag_browser_);
   drag_browser_ = browser_;
@@ skipping 160 matching lines @@
 gfx::Rect TabOverviewController::CalculateHostBounds() {
   int max_width = monitor_bounds_.width() - kMonitorPadding * 2;
   int window_height = monitor_bounds_.height() * kWindowHeight;
   int max_height = static_cast<int>(monitor_bounds_.height() *
                                     kOverviewHeight);
   return gfx::Rect(monitor_bounds_.x() + kMonitorPadding,
                    monitor_bounds_.bottom() - window_height -
                    kWindowToOverviewPadding - max_height, max_width,
                    max_height);
 }