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 38604692338f2e9caabc1c3447cdc77b1a6fcbed..786a10689547899ec902e8b8edf43b70bc37621d 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,
-      bool should_bypass_main_world_csp);
+      bool should_bypass_main_world_csp,
+      bool is_form_submission);
   ~NavigationHandleImpl() override;
 
   // NavigationHandle implementation:
@@ -151,6 +152,10 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   NavigationData* GetNavigationData() override;
   bool should_bypass_main_world_csp() const;
 
+  // Whether or not the navigation has been initiated by a form submission. It
+  // is currently not available when PlzNavigate is disabled.
+  bool is_form_submission() const;
+
   // 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
@@ -354,7 +359,8 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
                        const base::TimeTicks& navigation_start,
                        int pending_nav_entry_id,
                        bool started_from_context_menu,
-                       bool should_bypass_main_world_csp);
+                       bool should_bypass_main_world_csp,
+                       bool is_form_submission);
 
   NavigationThrottle::ThrottleCheckResult CheckWillStartRequest();
   NavigationThrottle::ThrottleCheckResult CheckWillRedirectRequest();
@@ -503,6 +509,9 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // blocked by the parent frame's CSP.
   bool should_bypass_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);