Implement "iframe shim" behavior for windowed plugins....

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
===================================================================
--- chrome/common/render_messages.h	(revision 2783)
+++ chrome/common/render_messages.h	(working copy)
@@ -1007,6 +1007,7 @@
     WriteParam(m, p.window);
     WriteParam(m, p.window_rect);
     WriteParam(m, p.clip_rect);
+    WriteParam(m, p.cutout_rects);
     WriteParam(m, p.visible);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
@@ -1014,6 +1015,7 @@
       ReadParam(m, iter, &p->window) &&
       ReadParam(m, iter, &p->window_rect) &&
       ReadParam(m, iter, &p->clip_rect) &&
+      ReadParam(m, iter, &p->cutout_rects) &&
       ReadParam(m, iter, &p->visible);
   }
   static void Log(const param_type& p, std::wstring* l) {
@@ -1024,6 +1026,8 @@
     l->append(L", ");
     LogParam(p.clip_rect, l);
     l->append(L", ");
+    LogParam(p.cutout_rects, l);
+    l->append(L", ");
     LogParam(p.visible, l);
     l->append(L")");
   }