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

extensions/renderer/resources/guest_view/guest_view.js

Index: extensions/renderer/resources/guest_view/guest_view.js
diff --git a/extensions/renderer/resources/guest_view/guest_view.js b/extensions/renderer/resources/guest_view/guest_view.js
index 27368a488f792040d6cfcfd90d270f48dc8ffd46..350c5f431db181c4a86ff94abab777690a7d6cf8 100644
--- a/extensions/renderer/resources/guest_view/guest_view.js
+++ b/extensions/renderer/resources/guest_view/guest_view.js
@@ -139,11 +139,16 @@ GuestViewImpl.prototype.attachImpl = function(
     return;
   }
 
+  var isSitePerProcess = GuestViewInternalNatives.IsSitePerProcess();
   // Callback wrapper function to store the contentWindow from the attachGuest()
   // callback, handle potential attaching failure, register an automatic detach,
   // and advance the queue.
   var callbackWrapper = function(callback, contentWindow) {
     // Check if attaching failed.
+    if (isSitePerProcess) {
+      contentWindow = this.guestView.browserPluginElement.contentWindow;
+    }
+
     if (!contentWindow) {
       this.state = GUEST_STATE_CREATED;
       this.internalInstanceId = 0;
@@ -156,10 +161,17 @@ GuestViewImpl.prototype.attachImpl = function(
   };
 
   attachParams['instanceId'] = viewInstanceId;
-  GuestViewInternalNatives.AttachGuest(internalInstanceId,
-                                       this.id,
-                                       attachParams,
-                                       callbackWrapper.bind(this, callback));
+  if (isSitePerProcess) {
+    var contentWindow = this.guestView.browserPluginElement.contentWindow;
+    GuestViewInternalNatives.AttachIframeGuest(
+        internalInstanceId, this.id, attachParams, contentWindow,
+        callbackWrapper.bind(this, callback));
+  } else {
+    GuestViewInternalNatives.AttachGuest(internalInstanceId,
+                                         this.id,
+                                         attachParams,
+                                         callbackWrapper.bind(this, callback));
+  }
 
   this.internalInstanceId = internalInstanceId;
   this.state = GUEST_STATE_ATTACHED;
@@ -185,13 +197,16 @@ GuestViewImpl.prototype.createImpl = function(createParams, callback) {
     return;
   }
 
+  var isSitePerProcess = GuestViewInternalNatives.IsSitePerProcess();
   // Callback wrapper function to store the guestInstanceId from the
   // createGuest() callback, handle potential creation failure, and advance the
   // queue.
   var callbackWrapper = function(callback, guestInfo) {
     this.id = guestInfo.id;
-    this.contentWindow =
-        GuestViewInternalNatives.GetContentWindow(guestInfo.contentWindowId);
+    if (!isSitePerProcess) {
+      this.contentWindow =
+          GuestViewInternalNatives.GetContentWindow(guestInfo.contentWindowId);
+    }
 
     // Check if creation failed.
     if (this.id === 0) {
@@ -277,6 +292,10 @@ function GuestView(viewType, guestInstanceId) {
   privates(this).internal = new GuestViewImpl(this, viewType, guestInstanceId);
 }
 
+GuestView.prototype.setBrowserPluginElement = function(browserPluginElement) {
+  this.browserPluginElement = browserPluginElement;
+}
+
 // Attaches the guestview to the container with ID |internalInstanceId|.
 GuestView.prototype.attach = function(
     internalInstanceId, viewInstanceId, attachParams, callback) {