Make <webview> use out-of-process iframe architecture.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index a6f7a4567da0a113b7945b2b8058d651d49377af..aa8f77ebef64b6d7a757bc79681bfbb697a09b70 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -25,6 +25,7 @@
 #include "base/values.h"
 #include "cc/base/switches.h"
 #include "content/browser/bad_message.h"
+#include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/dom_storage/session_storage_namespace_impl.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ -325,6 +326,10 @@ bool RenderViewHostImpl::CreateRenderView(
   params.enable_auto_resize = auto_resize_enabled();
   params.min_size = min_size_for_auto_resize();
   params.max_size = max_size_for_auto_resize();
+  params.is_inner_web_contents_in_site_per_process =

[nasko, 2015/05/22 16:32:27]

Why not use this conditional and set the proxy_routing_id to MSG_ROUTING_NONE?
Then the boolean isn't used at all.

[Charlie Reis, 2015/05/22 23:44:31]

+1

[lazyboy, 2015/05/26 16:32:54]

OK.
Guess that's OK, we wanted to be explicit about this step
so that's the code is easy to reason about/read. However, now
that I think about it, adding a new bool isn't super either.
Removed.

+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess) &&
+      BrowserPluginGuest::IsGuest(this);
   GetResizeParams(&params.initial_size);
   if (!is_active_) {
     params.replicated_frame_state =