PlzNavigate: add support for BLOCK_REQUEST during redirects

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index ae93eee9f77a981de15ff9d82434a3fe7141a09b..7c62aa429f8cd250a2092f50d8745d0cd9cea10e 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -317,6 +317,18 @@ void NavigationHandleImpl::Resume() {
     result = CheckWillStartRequest();
   } else if (state_ == DEFERRING_REDIRECT) {
     result = CheckWillRedirectRequest();
+    if (!IsBrowserSideNavigationEnabled() &&
+        result != NavigationThrottle::PROCEED &&
+        result != NavigationThrottle::DEFER) {
+      // The renderer will not be informed of the redirect, as the navigation
+      // will have been cancelled before sending the
+      // ResourceMsg_ReceivedRedirect IPC. Reset the URL of the NavigationHandle
+      // to the URL it had prior to the redirect, to match the commit of an
+      // error page.
+      redirect_chain_.pop_back();
+      DCHECK(!redirect_chain_.empty());
+      url_ = redirect_chain_.back();
+    }
   } else {
     result = CheckWillProcessResponse();
 
@@ -563,14 +575,27 @@ void NavigationHandleImpl::WillRedirectRequest(
   state_ = WILL_REDIRECT_REQUEST;
   complete_callback_ = callback;
 
+  // Notify each throttle of the request.
+  NavigationThrottle::ThrottleCheckResult result = NavigationThrottle::DEFER;
   if (IsSelfReferentialURL()) {
     state_ = CANCELING;
-    RunCompleteCallback(NavigationThrottle::CANCEL);
-    return;
+    result = NavigationThrottle::CANCEL;
+  } else {
+    result = CheckWillRedirectRequest();
   }
 
-  // Notify each throttle of the request.
-  NavigationThrottle::ThrottleCheckResult result = CheckWillRedirectRequest();
+  if (!IsBrowserSideNavigationEnabled() &&
+      result != NavigationThrottle::PROCEED &&
+      result != NavigationThrottle::DEFER) {
+    // The renderer will not be informed of the redirect, as the navigation
+    // will have been cancelled before sending the
+    // ResourceMsg_ReceivedRedirect IPC. Reset the URL of the NavigationHandle
+    // to the URL it had prior to the redirect, to match the commit of an
+    // error page.
+    redirect_chain_.pop_back();
+    DCHECK(!redirect_chain_.empty());
+    url_ = redirect_chain_.back();
+  }
 
   // If the navigation is not deferred, run the callback.
   if (result != NavigationThrottle::DEFER)
@@ -681,9 +706,9 @@ NavigationHandleImpl::CheckWillStartRequest() {
       case NavigationThrottle::PROCEED:
         continue;
 
+      case NavigationThrottle::BLOCK_REQUEST:
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
-      case NavigationThrottle::BLOCK_REQUEST:
         state_ = CANCELING;
         return result;
 
@@ -713,6 +738,7 @@ NavigationHandleImpl::CheckWillRedirectRequest() {
       case NavigationThrottle::PROCEED:
         continue;
 
+      case NavigationThrottle::BLOCK_REQUEST:
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
         state_ = CANCELING;
@@ -723,7 +749,6 @@ NavigationHandleImpl::CheckWillRedirectRequest() {
         next_index_ = i + 1;
         return result;
 
-      case NavigationThrottle::BLOCK_REQUEST:
       case NavigationThrottle::BLOCK_RESPONSE:
         NOTREACHED();
     }