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

components/guest_view/browser/guest_view_base.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/guest_view/browser/guest_view_base.h"
 
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/guest_view/browser/guest_view_event.h"
 #include "components/guest_view/browser/guest_view_manager.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "components/guest_view/common/guest_view_messages.h"
 #include "components/ui/zoom/page_zoom.h"
 #include "components/ui/zoom/zoom_controller.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/common/page_zoom.h"
 #include "content/public/common/url_constants.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 using content::WebContents;
 
 namespace content {
 struct FrameNavigateParams;
 }
 
@@ skipping 520 matching lines @@
 
   // Self-destruct.
   delete this;
 }
 
 void GuestViewBase::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
   if (attached() && ZoomPropagatesFromEmbedderToGuest())
     SetGuestZoomLevelToMatchEmbedder();
+
+  // TODO(lazyboy): This breaks guest visibility in --site-per-process.

[Charlie Reis, 2015/05/22 23:44:30]

Can you explain a little more about the case that's broken in the TODO, to make
it easier to revisit and fix?

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

Done.

+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess)) {
+    web_contents()->WasShown();
+  }
 }
 
 void GuestViewBase::ActivateContents(WebContents* web_contents) {
   if (!attached() || !embedder_web_contents()->GetDelegate())
     return;
 
   embedder_web_contents()->GetDelegate()->ActivateContents(
       embedder_web_contents());
 }
 
@@ skipping 252 matching lines @@
 
   auto embedder_zoom_controller =
       ui_zoom::ZoomController::FromWebContents(owner_web_contents());
   // Chrome Apps do not have a ZoomController.
   if (!embedder_zoom_controller)
     return;
   embedder_zoom_controller->RemoveObserver(this);
 }
 
 }  // namespace guest_view