[chromecast] Pass media task runner to VideoPlaneController.

chromecast/graphics/cast_screen.cc

Index: chromecast/graphics/cast_screen.cc
diff --git a/chromecast/graphics/cast_screen.cc b/chromecast/graphics/cast_screen.cc
index 507e234f44d4592177a90efd5461ac71f8cea0b1..2017dc9a0fb042e9ab72279e9c06fbf04812ca33 100644
--- a/chromecast/graphics/cast_screen.cc
+++ b/chromecast/graphics/cast_screen.cc
@@ -33,8 +33,15 @@ const int kInitDisplayHeight = k720pHeight;
 CastScreen::~CastScreen() {
 }
 
+void CastScreen::SetDisplayResizeCallback(const DisplayResizeCallback& cb) {
+  DCHECK(!cb.is_null());
+  display_resize_cb_ = cb;
+}
+
 void CastScreen::UpdateDisplaySize(const gfx::Size& size) {
   display_.SetScaleAndBounds(1.0f, gfx::Rect(size));
+  if (!display_resize_cb_.is_null())
+    display_resize_cb_.Run(Size(size.width(), size.height()));
 }
 
 gfx::Point CastScreen::GetCursorScreenPoint() {