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

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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 "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 268 matching lines @@
                                                     int identifier)
     : render_process_id(render_process_id),
       render_frame_id(render_frame_id),
       chooser(chooser),
       identifier(identifier) {
 }
 
 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,
                                  WebContentsImpl* opener)
     : delegate_(NULL),
       controller_(this, browser_context),
       render_view_host_delegate_view_(NULL),
       opener_(opener),
       created_with_opener_(!!opener),
 #if defined(OS_WIN)
@@ skipping 827 matching lines @@
 bool WebContentsImpl::NeedToFireBeforeUnload() {
   // TODO(creis): Should we fire even for interstitial pages?
   return WillNotifyDisconnection() && !ShowingInterstitialPage() &&
          !GetRenderViewHost()->SuddenTerminationAllowed();
 }
 
 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());
 }
 
 WebContents* WebContentsImpl::Clone() {
   // We use our current SiteInstance since the cloned entry will use it anyway.
   // We pass our own opener so that the cloned page can access it if it was
   // before.
   CreateParams create_params(GetBrowserContext(), GetSiteInstance());
@@ skipping 51 matching lines @@
               params.main_frame_routing_id == MSG_ROUTING_NONE) ||
          (params.routing_id != MSG_ROUTING_NONE &&
               params.main_frame_routing_id != MSG_ROUTING_NONE));
   GetRenderManager()->Init(
       params.browser_context, params.site_instance, params.routing_id,
       params.main_frame_routing_id);
 
   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_));
 
     WebContentsViewGuest* rv = new WebContentsViewGuest(
         this, browser_plugin_guest_.get(), platform_view.Pass(),
         render_view_host_delegate_view_);
     render_view_host_delegate_view_ = rv;
     view_.reset(rv);
   } else {
     // Regular WebContentsView.
@@ skipping 288 matching lines @@
     int route_id,
     int main_frame_route_id,
     const ViewHostMsg_CreateWindow_Params& params,
     SessionStorageNamespace* session_storage_namespace) {
   // We usually create the new window in the same BrowsingInstance (group of
   // script-related windows), by passing in the current SiteInstance.  However,
   // if the opener is being suppressed (in a non-guest), we create a new
   // 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.
   DCHECK(!params.opener_suppressed || route_id == MSG_ROUTING_NONE);
 
   scoped_refptr<SiteInstance> site_instance =
       params.opener_suppressed && !is_guest ?
       SiteInstance::CreateForURL(GetBrowserContext(), params.target_url) :
       GetSiteInstance();
 
@@ skipping 198 matching lines @@
 void WebContentsImpl::ShowCreatedWidget(int route_id,
                                         bool is_fullscreen,
                                         const gfx::Rect& initial_rect) {
   RenderWidgetHostViewBase* widget_host_view =
       static_cast<RenderWidgetHostViewBase*>(GetCreatedWidget(route_id));
   if (!widget_host_view)
     return;
 
   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();
   }
 
   if (is_fullscreen) {
     DCHECK_EQ(MSG_ROUTING_NONE, fullscreen_widget_routing_id_);
     view_->StoreFocus();
     fullscreen_widget_routing_id_ = route_id;
     if (delegate_ && delegate_->EmbedsFullscreenWidget()) {
@@ skipping 2424 matching lines @@
     int proxy_routing_id,
     bool for_main_frame_navigation) {
   TRACE_EVENT0("browser,navigation",
                "WebContentsImpl::CreateRenderViewForRenderManager");
   // Can be NULL during tests.
   RenderWidgetHostViewBase* rwh_view;
   // TODO(kenrb): RenderWidgetHostViewChildFrame special casing is temporary
   // 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);
   }
 
   // Now that the RenderView has been created, we need to tell it its size.
   if (rwh_view)
     rwh_view->SetSize(GetSizeForNewRenderView());
 
   // Make sure we use the correct starting page_id in the new RenderView.
   UpdateMaxPageIDIfNecessary(render_view_host);
@@ skipping 118 matching lines @@
   last_reported_encoding_ = encoding;
 
   canonical_encoding_ = GetContentClient()->browser()->
       GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 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();
 }
 
 BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() const {
   return browser_plugin_guest_.get();
 }
 
 void WebContentsImpl::SetBrowserPluginGuest(BrowserPluginGuest* guest) {
   CHECK(!browser_plugin_guest_);
+  CHECK(guest);
   browser_plugin_guest_.reset(guest);
 }
 
 BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() const {
   return browser_plugin_embedder_.get();
 }
 
 void WebContentsImpl::CreateBrowserPluginEmbedderIfNecessary() {
   if (browser_plugin_embedder_)
     return;
@@ skipping 86 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content