Expose mojo bindings to subframes in layout tests.

content/renderer/render_frame_impl.cc

 // 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.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1072 matching lines @@
 
   bool is_tracing = false;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED("navigation", &is_tracing);
   if (is_tracing) {
     int parent_id = GetRoutingIdForFrameOrProxy(frame_->parent());
     TRACE_EVENT2("navigation", "RenderFrameImpl::Initialize",
                  "id", routing_id_,
                  "parent", parent_id);
   }
 
-  if (IsMainFrame() &&
-      RenderProcess::current()->GetEnabledBindings() & BINDINGS_POLICY_WEB_UI) {
-    EnableMojoBindings(false /* for_layout_tests */);
-  }
+  MaybeEnableMojoBindings();
 
 #if defined(ENABLE_PLUGINS)
   new PepperBrowserConnection(this);
 #endif
   new SharedWorkerRepository(this);
 
   if (IsLocalRoot() && !is_swapped_out_) {
     // DevToolsAgent is a RenderFrameObserver, and will destruct itself
     // when |this| is deleted.
     devtools_agent_ = new DevToolsAgent(this);
@@ skipping 4652 matching lines @@
 
 void RenderFrameImpl::SendUpdateState() {
   DCHECK(SiteIsolationPolicy::UseSubframeNavigationEntries());
   if (current_history_item_.isNull())
     return;
 
   Send(new FrameHostMsg_UpdateState(
       routing_id_, SingleHistoryItemToPageState(current_history_item_)));
 }
 
-void RenderFrameImpl::EnableMojoBindings(bool for_layout_tests) {
+void RenderFrameImpl::MaybeEnableMojoBindings() {
+  int enabled_bindings = RenderProcess::current()->GetEnabledBindings();
+  // BINDINGS_POLICY_WEB_UI and BINDINGS_POLICY_MOJO are mutually exclusive.
+  // They both provide access to Mojo bindings, but do so in incompatible ways.
+  const int kMojoAndWebUiBindings =
+      BINDINGS_POLICY_WEB_UI | BINDINGS_POLICY_MOJO;
+  DCHECK_NE(enabled_bindings & kMojoAndWebUiBindings, kMojoAndWebUiBindings);
+
   // If an MojoBindingsController already exists for this RenderFrameImpl, avoid
   // creating another one. It is not kept as a member, as it deletes itself when
   // the frame is destroyed.
-  if (!RenderFrameObserverTracker<MojoBindingsController>::Get(this))
-    new MojoBindingsController(this, for_layout_tests);
+  if (RenderFrameObserverTracker<MojoBindingsController>::Get(this))
+    return;
+
+  if (IsMainFrame() &&
+      enabled_bindings & BINDINGS_POLICY_WEB_UI) {
+    new MojoBindingsController(this, false /* for_layout_tests */);
+  } else if (enabled_bindings & BINDINGS_POLICY_MOJO) {
+    new MojoBindingsController(this, true /* for_layout_tests */);
+  }
 }
 
 void RenderFrameImpl::SendFailedProvisionalLoad(
     const blink::WebURLRequest& request,
     const blink::WebURLError& error,
     blink::WebLocalFrame* frame) {
   bool show_repost_interstitial =
       (error.reason == net::ERR_CACHE_MISS &&
        base::EqualsASCII(base::StringPiece16(request.httpMethod()), "POST"));
 
@@ skipping 287 matching lines @@
                                     int match_count,
                                     int ordinal,
                                     const WebRect& selection_rect,
                                     bool final_status_update) {
   Send(new FrameHostMsg_Find_Reply(routing_id_, request_id, match_count,
                                    selection_rect, ordinal,
                                    final_status_update));
 }
 
 }  // namespace content