[Android] Add supportMultipleWindows setting

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 7b83e8b62c0fb4cb2f9f959088f59562a40c5109..94b4fa95e7cc06a2ac12c4f5ae9e020a5f2e2744 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2364,13 +2364,20 @@ void RenderViewImpl::didBlur() {
 // created RenderView (i.e., as a blocked popup or as a new tab).
 //
 void RenderViewImpl::show(WebNavigationPolicy policy) {
-  DCHECK(!did_show_) << "received extraneous Show call";
-  DCHECK(opener_id_ != MSG_ROUTING_NONE);
-
-  if (did_show_)
+  if (did_show_) {
+#if defined(OS_ANDROID)
+    // When supports_multiple_windows is disabled, popups are reusing
+    // the same view. In some scenarios, this makes WebKit to call show() twice.
+    if (!webkit_preferences_.supports_multiple_windows)
+      return;
+#endif
+    NOTREACHED() << "received extraneous Show call";
     return;
+  }
   did_show_ = true;
 
+  DCHECK(opener_id_ != MSG_ROUTING_NONE);
+
   if (GetContentClient()->renderer()->AllowPopup(creator_url_))
     opened_by_user_gesture_ = true;