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

content/browser/frame_host/render_frame_host_manager.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 
 #include <list>
 
 #include "base/basictypes.h"
@@ skipping 155 matching lines @@
     // to see what it should do.
     virtual bool FocusLocationBarByDefault() = 0;
 
     // Focuses the location bar.
     virtual void SetFocusToLocationBar(bool select_all) = 0;
 
     // Returns true if views created for this delegate should be created in a
     // hidden state.
     virtual bool IsHidden() = 0;
 
+    virtual int64 GetParentFrameTreeNodeID() = 0;

[Charlie Reis, 2015/04/08 23:42:11]

This needs a better name.  A RFHM belongs to a FrameTreeNode, which may have a
parent FrameTreeNode in the current WebContents.  In contrast, this method
normally returns -1 unless the WebContents itself has a parent WebContents.

Maybe something like GetEmbedderFrameTreeNodeID()?

[lazyboy, 2015/04/14 01:38:03]

Changed to GetEmbedderFrameTreeNodeID(), added doc.

+
    protected:
     virtual ~Delegate() {}
   };
 
   // Used with FrameTree::ForEach to delete RenderFrameHosts pending shutdown
   // from a FrameTreeNode's RenderFrameHostManager. Used during destruction of
   // WebContentsImpl.
   static bool ClearRFHsPendingShutdown(FrameTreeNode* node);
 
   // All three delegate pointers must be non-NULL and are not owned by this
@@ skipping 26 matching lines @@
   }
 
   // TODO(creis): Remove this when we no longer use RVH for navigation.
   RenderViewHostImpl* current_host() const;
 
   // Returns the view associated with the current RenderViewHost, or NULL if
   // there is no current one.
   RenderWidgetHostView* GetRenderWidgetHostView() const;
 
   RenderFrameProxyHost* GetProxyToParent();
+  RenderFrameProxyHost* GetProxyToEmbedder();
 
   // Returns the pending RenderFrameHost, or NULL if there is no pending one.
   RenderFrameHostImpl* pending_frame_host() const {
     return pending_render_frame_host_.get();
   }
 
   // TODO(creis): Remove this when we no longer use RVH for navigation.
   RenderViewHostImpl* pending_render_view_host() const;
 
   // Returns the current committed Web UI or NULL if none applies.
@@ skipping 176 matching lines @@
   void OnDidStopLoading();
 
   // Send updated frame name to all frame proxies when the frame changes its
   // window.name property.
   void OnDidUpdateName(const std::string& name);
 
   void EnsureRenderViewInitialized(FrameTreeNode* source,
                                    RenderViewHostImpl* render_view_host,
                                    SiteInstance* instance);
 
+  // Creates a proxy pointing to embedder process inside a guest RFHM.

[Charlie Reis, 2015/04/08 23:42:11]

Terminology: "proxy for frame X in process Y"
Pointing to a process doesn't really make sense; instead, the proxy lives in the
process and represents a frame rendered elsewhere.

[lazyboy, 2015/04/14 01:38:03]

Thanks for the terminology.
Changed.

+  // This proxy is used to swap out the initial guest frame in embedder.
+  // Returns the routing id of the created proxy.
+  int CreateEmbedderProxy(SiteInstance* embedder_site_instance,
+                          int* swapped_out_render_view_routing_id);

[Charlie Reis, 2015/04/08 23:42:11]

Let's avoid having a mix of return parameters and out parameters if we can.

[lazyboy, 2015/04/14 01:38:03]

I've changed both to out parameters.

+
+  // Replaces initial guest frame in embedder with the proxy that has routing
+  // id |proxy_to_embedder_routing_id|.
+  void ReplaceWithGuestProxy(int proxy_to_embedder_routing_id);
+
  private:
   friend class NavigatorTestWithBrowserSideNavigation;
   friend class RenderFrameHostManagerTest;
   friend class TestWebContents;
 
   FRIEND_TEST_ALL_PREFIXES(CrossProcessFrameTreeBrowserTest,
                            CreateCrossProcessSubframeProxies);
 
   // Used with FrameTree::ForEach to erase RenderFrameProxyHosts from a
   // FrameTreeNode's RenderFrameHostManager.
@@ skipping 275 matching lines @@
   bool should_reuse_web_ui_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_