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

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 448a65fd0bce0389f31d1713b2dbd26ad105a44c..81f5c3fb829cb1bfa91f9161816a52dfa9379790 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -541,6 +541,12 @@ IPC_STRUCT_BEGIN(ViewMsg_New_Params)
 
   // The maximum size to layout the page if auto-resize is enabled.
   IPC_STRUCT_MEMBER(gfx::Size, max_size)
+
+  // Whether the RenderView belongs to an inner WebContents in
+  // --site-per-process mode.
+  // TODO(lazyboy): Remove once we can create RFP without swapped out
+  // RenderView.
+  IPC_STRUCT_MEMBER(bool, is_inner_web_contents_in_site_per_process)
 IPC_STRUCT_END()
 
 // Messages sent from the browser to the renderer.