Set correct viewport size for an out of process iframe.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index a2b838a34afbe17a1e6a45efb1287af9313ce973..2bf258b03571360585ee4cc786e74bf25a957af8 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -714,6 +714,8 @@ void RenderFrameImpl::OnSwapOut() {
     // frame?
     frame_->stopLoading();
 
+    frame_->setIsRemote(true);
+
     // Replace the page with a blank dummy URL. The unload handler will not be
     // run a second time, thanks to a check in FrameLoader::stopLoading.
     // TODO(creis): Need to add a better way to do this that avoids running the
@@ -2016,6 +2018,12 @@ void RenderFrameImpl::forwardInputEvent(const blink::WebInputEvent* event) {
   Send(new FrameHostMsg_ForwardInputEvent(routing_id_, event));
 }
 
+void RenderFrameImpl::initializeChildFrame(const blink::WebRect& frame_rect,
+                                           float scale_factor) {
+  Send(new FrameHostMsg_InitializeChildFrame(
+      routing_id_, frame_rect, scale_factor));
+}
+
 void RenderFrameImpl::AddObserver(RenderFrameObserver* observer) {
   observers_.AddObserver(observer);
 }