PlzNavigate: Enforce 'form-action' CSP on the browser-side.

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 819d847e9abfd8fdb2875405a7a87722d0cb5e27..41bedf9300dac15f59c3448b550f5600123f9236 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -92,7 +92,8 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
       const base::TimeTicks& navigation_start,
       int pending_nav_entry_id,
       bool started_from_context_menu,
-      CSPDisposition should_check_main_world_csp);
+      CSPDisposition should_check_main_world_csp,
+      bool is_form_submission);
   ~NavigationHandleImpl() override;
 
   // Used to track the state the navigation is currently in.
@@ -171,6 +172,11 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // Used in tests.
   State state_for_testing() const { return state_; }
 
+  // Whether or not the navigation has been initiated by a form submission.
+  // TODO(arthursonzogni): This value is correct only when PlzNavigate is
+  // enabled. Make it work in both modes.
+  bool is_form_submission() const { return is_form_submission_; }
+
   // The NavigatorDelegate to notify/query for various navigation events.
   // Normally this is the WebContents, except if this NavigationHandle was
   // created during a navigation to an interstitial page. In this case it will
@@ -375,7 +381,8 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
                        const base::TimeTicks& navigation_start,
                        int pending_nav_entry_id,
                        bool started_from_context_menu,
-                       CSPDisposition should_check_main_world_csp);
+                       CSPDisposition should_check_main_world_csp,
+                       bool is_form_submission);
 
   NavigationThrottle::ThrottleCheckResult CheckWillStartRequest();
   NavigationThrottle::ThrottleCheckResult CheckWillRedirectRequest();
@@ -536,6 +543,9 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // in the main world should not apply.
   CSPDisposition should_check_main_world_csp_;
 
+  // Whether or not the navigation results from the submission of a form.
+  bool is_form_submission_;
+
   base::WeakPtrFactory<NavigationHandleImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);