Allow SiteInstance for about:blank in new tab to be reused.

content/browser/tab_contents/tab_contents_unittest.cc

Index: content/browser/tab_contents/tab_contents_unittest.cc
diff --git a/content/browser/tab_contents/tab_contents_unittest.cc b/content/browser/tab_contents/tab_contents_unittest.cc
index bb7c7d469c3b281c9304c85649d60af32c93652a..7f3cca734b9c61e026e9800b687723aefb22e53c 100644
--- a/content/browser/tab_contents/tab_contents_unittest.cc
+++ b/content/browser/tab_contents/tab_contents_unittest.cc
@@ -972,8 +972,9 @@ TEST_F(TabContentsTest, NavigationEntryContentState) {
   EXPECT_FALSE(entry->GetContentState().empty());
 }
 
-// Test that NavigationEntries have the correct content state after opening
-// a new window to about:blank.  Prevents regression for bug 1116137.
+// Test that NavigationEntries have the correct content state and SiteInstance
+// state after opening a new window to about:blank.  Prevents regression for
+// bugs b/1116137 and http://crbug.com/111975.
 TEST_F(TabContentsTest, NavigationEntryContentStateNewWindow) {
   TestRenderViewHost* orig_rvh = rvh();
 
@@ -986,6 +987,25 @@ TEST_F(TabContentsTest, NavigationEntryContentStateNewWindow) {
   // Should have a content state here.
   NavigationEntry* entry = controller().GetLastCommittedEntry();
   EXPECT_FALSE(entry->GetContentState().empty());
+
+  // The SiteInstance should be available for other navigations to use.
+  NavigationEntryImpl* entry_impl =
+      NavigationEntryImpl::FromNavigationEntry(entry);
+  EXPECT_FALSE(entry_impl->site_instance()->HasSite());
+  int32 site_instance_id = entry_impl->site_instance()->GetId();
+
+  // Navigating to a normal page should not cause a process swap.
+  const GURL new_url("http://www.google.com");
+  controller().LoadURL(new_url, content::Referrer(),
+                       content::PAGE_TRANSITION_TYPED, std::string());
+  EXPECT_FALSE(contents()->cross_navigation_pending());
+  EXPECT_EQ(orig_rvh, contents()->GetRenderViewHost());
+  contents()->TestDidNavigate(orig_rvh, 1, new_url,
+                              content::PAGE_TRANSITION_TYPED);
+  NavigationEntryImpl* entry_impl2 = NavigationEntryImpl::FromNavigationEntry(
+      controller().GetLastCommittedEntry());
+  EXPECT_EQ(site_instance_id, entry_impl2->site_instance()->GetId());
+  EXPECT_TRUE(entry_impl2->site_instance()->HasSite());
 }
 
 ////////////////////////////////////////////////////////////////////////////////