Add ref-count on RenderViewHost for each new RenderFrameProxyHost.

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 c09d4297e59b979b3f5922d119e03393d6ee7607..000079ab3328c35ec417b47325840294a2e2967a 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -459,11 +459,16 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CleanupCrossSiteIframe) {
   EXPECT_EQ(foo_url, observer.last_navigation_url());
 
   // Ensure that we have created a new process for the subframes.
+  RenderFrameHostImpl* child1_rfh = root->child_at(0)->current_frame_host();
+  RenderFrameHostImpl* child2_rfh = root->child_at(1)->current_frame_host();
   ASSERT_EQ(2U, root->child_count());
   EXPECT_NE(shell()->web_contents()->GetSiteInstance(),
-            root->child_at(0)->current_frame_host()->GetSiteInstance());
-  EXPECT_EQ(root->child_at(0)->current_frame_host()->GetSiteInstance(),
-            root->child_at(1)->current_frame_host()->GetSiteInstance());
+            child1_rfh->GetSiteInstance());
+  EXPECT_EQ(child1_rfh->GetSiteInstance(), child2_rfh->GetSiteInstance());
+
+  int subframe_process = child1_rfh->GetSiteInstance()->GetProcess()->GetID();

[Charlie Reis, 2015/05/21 18:48:16]

At the risk of spilling to the next line, I think subframe_process_id would be a
clearer name.

[nasko, 2015/05/21 21:28:08]

Done.

+  int subframe_rvh = child1_rfh->render_view_host()->GetRoutingID();
+  EXPECT_TRUE(RenderViewHost::FromID(subframe_process, subframe_rvh));
 
   // Use Javascript in the parent to remove one of the frames and ensure that
   // the subframe goes away.
@@ -477,6 +482,8 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, CleanupCrossSiteIframe) {
   GURL new_url(embedded_test_server()->GetURL("/title1.html"));
   NavigateToURL(shell(), new_url);
   ASSERT_EQ(0U, root->child_count());
+
+  EXPECT_FALSE(RenderViewHost::FromID(subframe_process, subframe_rvh));

[Charlie Reis, 2015/05/21 18:48:16]

// Ensure the RVH for the subframe gets cleaned up when the frame goes away.

[nasko, 2015/05/21 21:28:08]

Done.

 }
 
 // Ensure that root frames cannot be detached.