Stretching NativeViewHost, and misc tab capture fixes.

ui/views/controls/native/native_view_host.cc

Index: ui/views/controls/native/native_view_host.cc
diff --git a/ui/views/controls/native/native_view_host.cc b/ui/views/controls/native/native_view_host.cc
index 452e5966b48334f7843fb332dd765b0095aafec8..81cb94b480ca37abd57f70e97c60dfaf9ce2cc10 100644
--- a/ui/views/controls/native/native_view_host.cc
+++ b/ui/views/controls/native/native_view_host.cc
@@ -51,6 +51,11 @@ void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
   PreferredSizeChanged();
 }
 
+void NativeViewHost::SetRenderingSize(const gfx::Size& size) {
+  rendering_size_ = size;
+  InvalidateLayout();
+}
+
 void NativeViewHost::NativeViewDestroyed() {
   // Detach so we can clear our state and notify the native_wrapper_ to release
   // ref on the native view.
@@ -92,9 +97,11 @@ void NativeViewHost::Layout() {
     // view.  Also, they should be positioned respecting the border insets
     // of the native view.
     gfx::Rect local_bounds = ConvertRectToWidget(GetContentsBounds());
-    native_wrapper_->ShowWidget(local_bounds.x(), local_bounds.y(),
-                                local_bounds.width(),
-                                local_bounds.height());
+    gfx::Size rendering_size =
+        rendering_size_.IsEmpty() ? local_bounds.size() : rendering_size_;
+    native_wrapper_->ShowWidget(
+        local_bounds.x(), local_bounds.y(), local_bounds.width(),
+        local_bounds.height(), rendering_size.width(), rendering_size.height());
   } else {
     native_wrapper_->HideWidget();
   }