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

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index b8fdb0193d5800ad2867f95a5c1dc74014bf1828..257321196323c8f04055da865dde1e3346849c13 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -4,12 +4,16 @@
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
+#include "base/command_line.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/render_process_host.h"
+#include "content/public/common/content_switches.h"
 
 namespace content {
 
@@ -134,6 +138,14 @@ void RenderWidgetHostViewChildFrame::UpdateCursor(const WebCursor& cursor) {
 }
 
 void RenderWidgetHostViewChildFrame::SetIsLoading(bool is_loading) {
+  // Inner WebContents reaches this, so skip the NOTREACHED() check below.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess) &&
+      BrowserPluginGuest::IsGuest(
+          static_cast<RenderViewHostImpl*>(RenderViewHost::From(host_)))) {

[nasko, 2015/05/28 22:13:46]

Why static cast? Just call RenderViewHostImpl::FromID, which will give you back
an Impl type.

[lazyboy, 2015/05/29 00:02:24]

I need From() not FromID(), did you want me to do
RenderViewHostImpl::FromID(host_->GetProcess()->GetID(), host_->GetRoutingID())
?

+    return;
+  }
+
   NOTREACHED();
 }