Perform navigation policy check on UI thread for --site-per-process.

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index 9a47b4b12f7173c4df1a8e334e3ee7b731c1d09f..8342cbe566a98228827b1996c03959bc1a860cc4 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -203,13 +203,16 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CrossSiteIframe) {
   GURL main_url(test_server()->GetURL("files/site_per_process_main.html"));
   NavigateToURL(shell(), main_url);
 
-  StartFrameAtDataURL();
+  // It is safe to obtain the root frame tree node here, as it doesn't change.
+  FrameTreeNode* root =
+      static_cast<WebContentsImpl*>(shell()->web_contents())->
+          GetFrameTree()->root();
 
   SitePerProcessWebContentsObserver observer(shell()->web_contents());
 
   // Load same-site page into iframe.
   GURL http_url(test_server()->GetURL("files/title1.html"));
-  EXPECT_TRUE(NavigateIframeToURL(shell(), http_url, "test"));
+  NavigateFrameToURL(root->child_at(0), http_url);
   EXPECT_EQ(http_url, observer.navigation_url());
   EXPECT_TRUE(observer.navigation_succeeded());
 
@@ -221,22 +224,44 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CrossSiteIframe) {
   GURL cross_site_url(test_server()->GetURL("files/title2.html"));
   replace_host.SetHostStr(foo_com);
   cross_site_url = cross_site_url.ReplaceComponents(replace_host);
-  EXPECT_TRUE(NavigateIframeToURL(shell(), cross_site_url, "test"));
+  NavigateFrameToURL(root->child_at(0), cross_site_url);
   EXPECT_EQ(cross_site_url, observer.navigation_url());
   EXPECT_TRUE(observer.navigation_succeeded());
 
   // Ensure that we have created a new process for the subframe.
-  FrameTreeNode* root =
-      static_cast<WebContentsImpl*>(shell()->web_contents())->
-          GetFrameTree()->root();
   ASSERT_EQ(1U, root->child_count());
   FrameTreeNode* child = root->child_at(0);
+  SiteInstance* site_instance = child->current_frame_host()->GetSiteInstance();
+  RenderViewHost* rvh = child->current_frame_host()->render_view_host();
+  RenderProcessHost* rph = child->current_frame_host()->GetProcess();
+  EXPECT_NE(shell()->web_contents()->GetRenderViewHost(), rvh);
+  EXPECT_NE(shell()->web_contents()->GetSiteInstance(), site_instance);
+  EXPECT_NE(shell()->web_contents()->GetRenderProcessHost(), rph);
+
+  // Load another cross-site page into the same iframe.
+  cross_site_url = test_server()->GetURL("files/title3.html");
+  std::string bar_com("bar.com");
+  replace_host.SetHostStr(bar_com);
+  cross_site_url = cross_site_url.ReplaceComponents(replace_host);
+  NavigateFrameToURL(root->child_at(0), cross_site_url);
+  EXPECT_EQ(cross_site_url, observer.navigation_url());
+  EXPECT_TRUE(observer.navigation_succeeded());
+
+  // Check again that a new process is created and is different from the
+  // top level one and the previous one.
+  ASSERT_EQ(1U, root->child_count());
+  child = root->child_at(0);
   EXPECT_NE(shell()->web_contents()->GetRenderViewHost(),
             child->current_frame_host()->render_view_host());
+  EXPECT_NE(rvh, child->current_frame_host()->render_view_host());
   EXPECT_NE(shell()->web_contents()->GetSiteInstance(),
-            child->current_frame_host()->render_view_host()->GetSiteInstance());
+            child->current_frame_host()->GetSiteInstance());
+  EXPECT_NE(site_instance,
+            child->current_frame_host()->GetSiteInstance());
   EXPECT_NE(shell()->web_contents()->GetRenderProcessHost(),
             child->current_frame_host()->GetProcess());
+  EXPECT_NE(rph, child->current_frame_host()->GetProcess());
+
 }
 
 // Crash a subframe and ensures its children are cleared from the FrameTree.