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

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 6228fbf1316f1e4295bfe077168b7be7b1e8a708..ee9471abcea7897511379e66a3f41b3b70cc8054 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -286,6 +286,17 @@ WebContentsImpl::ColorChooserInfo::ColorChooserInfo(int render_process_id,
 WebContentsImpl::ColorChooserInfo::~ColorChooserInfo() {
 }
 
+// WebContentsImpl::WebContentsTreeNode ----------------------------------------
+WebContentsImpl::WebContentsTreeNode::WebContentsTreeNode()
+    : parent_web_contents_(nullptr) {
+}
+
+WebContentsImpl::WebContentsTreeNode::~WebContentsTreeNode() {
+  // TODO(lazyboy): Enforce that a child WebContentsTreeNode gets deleted
+  // before its parent.  Otherwise the child could have a stale pointer to its
+  // parent WebContents, risking a use-after-free.
+}
+
 // WebContentsImpl -------------------------------------------------------------
 
 WebContentsImpl::WebContentsImpl(BrowserContext* browser_context,
@@ -1133,6 +1144,32 @@ void WebContentsImpl::DispatchBeforeUnload(bool for_cross_site_transition) {
   GetMainFrame()->DispatchBeforeUnload(for_cross_site_transition);
 }
 
+void WebContentsImpl::AttachToEmbedderFrame(WebContents* embedder_web_contents,
+                                            RenderFrameHost* embedder_frame) {
+  CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess));
+  // 1. Create a link to our parent WebContents.

[nasko, 2015/05/05 21:34:50]

nit: I don't know if the numbering of the comments brings any value to them.

[lazyboy, 2015/05/05 22:33:53]

Removed numbers.

+  node_.set_parent_web_contents(
+      static_cast<WebContentsImpl*>(embedder_web_contents));
+
+  DCHECK(embedder_frame);
+
+  // 2. Create a swapped out RVH and a proxy in our render manager, pointing
+  // to the embedder's SiteInstance. The swapped out RVH will be used to send
+  // postMessage to guest.
+  int proxy_to_embedder_routing_id = GetRenderManager()->CreateEmbedderProxy(
+      embedder_frame->GetSiteInstance());
+
+  // 3. Swap the embedder's initial frame for the guest with the proxy
+  // we've created above.
+  // The proxy has a CPFC and it uses the swapped out RV as its RenderWidget,
+  // which gives us input and rendering.
+  static_cast<RenderFrameHostImpl*>(embedder_frame)
+      ->frame_tree_node()
+      ->render_manager()
+      ->ReplaceWithGuestProxy(proxy_to_embedder_routing_id);
+}
+
 void WebContentsImpl::Stop() {
   GetRenderManager()->Stop();
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, NavigationStopped());
@@ -1204,7 +1241,9 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   WebContentsViewDelegate* delegate =
       GetContentClient()->browser()->GetWebContentsViewDelegate(this);
 
-  if (browser_plugin_guest_) {
+  if (browser_plugin_guest_ &&
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess)) {
     scoped_ptr<WebContentsView> platform_view(CreateWebContentsView(
         this, delegate, &render_view_host_delegate_view_));
 
@@ -1513,6 +1552,13 @@ void WebContentsImpl::CreateNewWindow(
   // SiteInstance in its own BrowsingInstance.
   bool is_guest = BrowserPluginGuest::IsGuest(this);
 
+  if (is_guest &&
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess)) {
+    // TODO(lazyboy): CreateNewWindow doesn't work for <webview> yet.
+    NOTREACHED();
+  }
+
   // If the opener is to be suppressed, the new window can be in any process.
   // Since routing ids are process specific, we must not have one passed in
   // as argument here.
@@ -1731,7 +1777,9 @@ void WebContentsImpl::ShowCreatedWidget(int route_id,
 
   RenderWidgetHostView* view = NULL;
   BrowserPluginGuest* guest = GetBrowserPluginGuest();
-  if (guest && guest->embedder_web_contents()) {
+  if (guest && guest->embedder_web_contents() &&
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess)) {
     view = guest->embedder_web_contents()->GetRenderWidgetHostView();
   } else {
     view = GetRenderWidgetHostView();
@@ -4176,10 +4224,16 @@ bool WebContentsImpl::CreateRenderViewForRenderManager(
   // until RenderWidgetHost is attached to RenderFrameHost. We need to special
   // case this because RWH is still a base class of RenderViewHost, and child
   // frame RWHVs are unique in that they do not have their own WebContents.
-  if (!for_main_frame_navigation) {
+  bool is_guest_in_site_per_process =
+      !!browser_plugin_guest_.get() &&
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSitePerProcess);
+  if (!for_main_frame_navigation || is_guest_in_site_per_process) {
     RenderWidgetHostViewChildFrame* rwh_view_child =
         new RenderWidgetHostViewChildFrame(render_view_host);
     rwh_view = rwh_view_child;
+    if (is_guest_in_site_per_process)
+      GetRenderManager()->SetGuestRWHView(rwh_view_child);
   } else {
     rwh_view = view_->CreateViewForWidget(render_view_host, false);
   }
@@ -4318,6 +4372,16 @@ bool WebContentsImpl::IsHidden() {
   return capturer_count_ == 0 && !should_normally_be_visible_;
 }
 
+int64 WebContentsImpl::GetEmbedderFrameTreeNodeID() {
+  if (node_.parent_web_contents()) {
+    return node_.parent_web_contents()
+        ->GetFrameTree()
+        ->root()
+        ->frame_tree_node_id();
+  }
+  return -1;
+}
+
 RenderFrameHostManager* WebContentsImpl::GetRenderManager() const {
   return frame_tree_.root()->render_manager();
 }
@@ -4328,6 +4392,7 @@ BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() const {
 
 void WebContentsImpl::SetBrowserPluginGuest(BrowserPluginGuest* guest) {
   CHECK(!browser_plugin_guest_);
+  CHECK(guest);
   browser_plugin_guest_.reset(guest);
 }