Prerenders that send a ViewHostMsg_OpenURL are canceled with FINAL_STATUS_OPEN_URL.

This message is sent when a navigation is initiated from a renderer but requires browser intervention, typically because a new render process will be created. Examples of where this happens are redirects from a "normal page" to a hosted app domain, or transitions from one origin to another when --enable-strict-site-isolation is specified.

BUG=105972
TEST=Install YouTube app. Start Chrome with --prerender=enabled. Go to prerender-test.appspot.com, and prerender youtube.com. Click on it and www.youtube.com should appear. Check chrome://net-internals#prerender and make sure that the youtube prerender was canceled with OpenURL as the final status.

Review URL: http://codereview.chromium.org/8785007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113011 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/prerender/prerender_contents.cc

@@ -88,6 +88,19 @@ class PrerenderContents::TabContentsDelegateImpl
       prerender_contents_(prerender_contents) {
   }
 
+ virtual TabContents* OpenURLFromTab(TabContents* source,
+                                     const OpenURLParams& params) OVERRIDE {
+    // |OpenURLFromTab| is typically called when a frame performs a navigation
+    // that requires the browser to perform the transition instead of WebKit.
+    // Examples include prerendering a site that redirects to an app URL,
+    // or if --enable-strict-site-isolation is specified and the prerendered
+    // frame redirects to a different origin.
+    // TODO(cbentzel): Consider supporting this is if it is a common case
+    // during prerenders.
+    prerender_contents_->Destroy(FINAL_STATUS_OPEN_URL);
+    return NULL;
+  }
+
   // TabContentsDelegate implementation:
   virtual bool ShouldAddNavigationToHistory(
       const history::HistoryAddPageArgs& add_page_args,

chrome/browser/prerender/prerender_final_status.cc

@@ -51,6 +51,7 @@ const char* kFinalStatusNames[] = {
   "No Use Group",
   "Match Complete Dummy",
   "Duplicate",
+  "OpenURL",
   "Max",
 };
 COMPILE_ASSERT(arraysize(kFinalStatusNames) == FINAL_STATUS_MAX + 1,

chrome/browser/prerender/prerender_final_status.h

@@ -52,6 +52,7 @@ enum FinalStatus {
   FINAL_STATUS_NO_USE_GROUP = 37,
   FINAL_STATUS_MATCH_COMPLETE_DUMMY = 38,
   FINAL_STATUS_DUPLICATE = 39,
+  FINAL_STATUS_OPEN_URL = 40,
   FINAL_STATUS_MAX,
 };