Initialize renderer color preferences to reasonable defaults.

BUG=158422
TEST=as in bug


Review URL: https://chromiumcodereview.appspot.com/11365096

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166146 0039d316-1c4b-4281-b951-d872f2087c98
 void Shell::PlatformSetContents() {
   WebContentsView* content_view = web_contents_->GetView();
   gtk_container_add(GTK_CONTAINER(vbox_), content_view->GetNativeView());
 }

 void Shell::PlatformSetContents() {
   WebContentsView* content_view = web_contents_->GetView();
   gtk_container_add(GTK_CONTAINER(vbox_), content_view->GetNativeView());
  content::RendererPreferences* prefs =
      web_contents_->GetMutableRendererPrefs();
  prefs->focus_ring_color = SkColorSetARGB(255, 229, 151, 0);
  prefs->thumb_active_color = SkColorSetRGB(244, 244, 244);
  prefs->thumb_inactive_color = SkColorSetRGB(234, 234, 234);
  prefs->track_color = SkColorSetRGB(211, 211, 211);
  prefs->active_selection_bg_color = SkColorSetRGB(30, 144, 255);
  prefs->active_selection_fg_color = SK_ColorWHITE;
  prefs->inactive_selection_bg_color = SkColorSetRGB(200, 200, 200);
  prefs->inactive_selection_fg_color = SkColorSetRGB(50, 50, 50);
 }
