gfx: Make conversions from Size to SizeF be explicit.

chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc

Index: chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
diff --git a/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc b/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
index 590316030b330e3ed692a417755c932b1499d796..fd428ba5c4b9a07ece6e1a2a1edea7215cb50b87 100644
--- a/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
+++ b/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
@@ -143,7 +143,7 @@ void TabListSceneLayer::PutLayer(JNIEnv* env,
       toolbar_y_offset, side_border_scale, attach_content, inset_border);
 
   if (attach_content) {
-    gfx::RectF self(own_tree_->position(), own_tree_->bounds());
+    gfx::RectF self(own_tree_->position(), gfx::SizeF(own_tree_->bounds()));
     gfx::RectF content(x, y, width, height);
 
     content_obscures_self_ |= content.Contains(self);